Moved the GainControlForNewAGC class to be a separate file.
Apart from being motivated in order to make the source files shorter
this is needed when separating the APM submodules structs into
separate files.

BUG=

Review URL: https://codereview.webrtc.org/1678813002

Cr-Commit-Position: refs/heads/master@{#11611}
diff --git a/webrtc/modules/audio_processing/BUILD.gn b/webrtc/modules/audio_processing/BUILD.gn
index 13da8d6..5834793 100644
--- a/webrtc/modules/audio_processing/BUILD.gn
+++ b/webrtc/modules/audio_processing/BUILD.gn
@@ -68,6 +68,8 @@
     "echo_cancellation_impl.h",
     "echo_control_mobile_impl.cc",
     "echo_control_mobile_impl.h",
+    "gain_control_for_experimental_agc.cc",
+    "gain_control_for_experimental_agc.h",
     "gain_control_impl.cc",
     "gain_control_impl.h",
     "high_pass_filter_impl.cc",
diff --git a/webrtc/modules/audio_processing/audio_processing.gypi b/webrtc/modules/audio_processing/audio_processing.gypi
index c665f5b..eaee644 100644
--- a/webrtc/modules/audio_processing/audio_processing.gypi
+++ b/webrtc/modules/audio_processing/audio_processing.gypi
@@ -78,6 +78,8 @@
         'echo_cancellation_impl.h',
         'echo_control_mobile_impl.cc',
         'echo_control_mobile_impl.h',
+        'gain_control_for_experimental_agc.cc',
+        'gain_control_for_experimental_agc.h',
         'gain_control_impl.cc',
         'gain_control_impl.h',
         'high_pass_filter_impl.cc',
diff --git a/webrtc/modules/audio_processing/audio_processing_impl.cc b/webrtc/modules/audio_processing/audio_processing_impl.cc
index b3f38f4..f385612 100644
--- a/webrtc/modules/audio_processing/audio_processing_impl.cc
+++ b/webrtc/modules/audio_processing/audio_processing_impl.cc
@@ -29,6 +29,7 @@
 #include "webrtc/modules/audio_processing/common.h"
 #include "webrtc/modules/audio_processing/echo_cancellation_impl.h"
 #include "webrtc/modules/audio_processing/echo_control_mobile_impl.h"
+#include "webrtc/modules/audio_processing/gain_control_for_experimental_agc.h"
 #include "webrtc/modules/audio_processing/gain_control_impl.h"
 #include "webrtc/modules/audio_processing/high_pass_filter_impl.h"
 #include "webrtc/modules/audio_processing/intelligibility/intelligibility_enhancer.h"
@@ -80,72 +81,6 @@
 // Throughout webrtc, it's assumed that success is represented by zero.
 static_assert(AudioProcessing::kNoError == 0, "kNoError must be zero");
 
-// This class has two main functionalities:
-//
-// 1) It is returned instead of the real GainControl after the new AGC has been
-//    enabled in order to prevent an outside user from overriding compression
-//    settings. It doesn't do anything in its implementation, except for
-//    delegating the const methods and Enable calls to the real GainControl, so
-//    AGC can still be disabled.
-//
-// 2) It is injected into AgcManagerDirect and implements volume callbacks for
-//    getting and setting the volume level. It just caches this value to be used
-//    in VoiceEngine later.
-class GainControlForNewAgc : public GainControl, public VolumeCallbacks {
- public:
-  explicit GainControlForNewAgc(GainControlImpl* gain_control)
-      : real_gain_control_(gain_control), volume_(0) {}
-
-  // GainControl implementation.
-  int Enable(bool enable) override {
-    return real_gain_control_->Enable(enable);
-  }
-  bool is_enabled() const override { return real_gain_control_->is_enabled(); }
-  int set_stream_analog_level(int level) override {
-    volume_ = level;
-    return AudioProcessing::kNoError;
-  }
-  int stream_analog_level() override { return volume_; }
-  int set_mode(Mode mode) override { return AudioProcessing::kNoError; }
-  Mode mode() const override { return GainControl::kAdaptiveAnalog; }
-  int set_target_level_dbfs(int level) override {
-    return AudioProcessing::kNoError;
-  }
-  int target_level_dbfs() const override {
-    return real_gain_control_->target_level_dbfs();
-  }
-  int set_compression_gain_db(int gain) override {
-    return AudioProcessing::kNoError;
-  }
-  int compression_gain_db() const override {
-    return real_gain_control_->compression_gain_db();
-  }
-  int enable_limiter(bool enable) override { return AudioProcessing::kNoError; }
-  bool is_limiter_enabled() const override {
-    return real_gain_control_->is_limiter_enabled();
-  }
-  int set_analog_level_limits(int minimum, int maximum) override {
-    return AudioProcessing::kNoError;
-  }
-  int analog_level_minimum() const override {
-    return real_gain_control_->analog_level_minimum();
-  }
-  int analog_level_maximum() const override {
-    return real_gain_control_->analog_level_maximum();
-  }
-  bool stream_is_saturated() const override {
-    return real_gain_control_->stream_is_saturated();
-  }
-
-  // VolumeCallbacks implementation.
-  void SetMicVolume(int volume) override { volume_ = volume; }
-  int GetMicVolume() override { return volume_; }
-
- private:
-  GainControl* real_gain_control_;
-  int volume_;
-};
-
 struct AudioProcessingImpl::ApmPublicSubmodules {
   ApmPublicSubmodules()
       : echo_cancellation(nullptr),
@@ -159,7 +94,8 @@
   rtc::scoped_ptr<LevelEstimatorImpl> level_estimator;
   rtc::scoped_ptr<NoiseSuppressionImpl> noise_suppression;
   rtc::scoped_ptr<VoiceDetectionImpl> voice_detection;
-  rtc::scoped_ptr<GainControlForNewAgc> gain_control_for_new_agc;
+  rtc::scoped_ptr<GainControlForExperimentalAgc>
+      gain_control_for_experimental_agc;
 
   // Accessed internally from both render and capture.
   rtc::scoped_ptr<TransientSuppressor> transient_suppressor;
@@ -248,8 +184,9 @@
         new NoiseSuppressionImpl(&crit_capture_));
     public_submodules_->voice_detection.reset(
         new VoiceDetectionImpl(&crit_capture_));
-    public_submodules_->gain_control_for_new_agc.reset(
-        new GainControlForNewAgc(public_submodules_->gain_control));
+    public_submodules_->gain_control_for_experimental_agc.reset(
+        new GainControlForExperimentalAgc(public_submodules_->gain_control,
+                                          &crit_capture_));
 
     private_submodules_->component_list.push_back(
         public_submodules_->echo_cancellation);
@@ -264,10 +201,10 @@
 
 AudioProcessingImpl::~AudioProcessingImpl() {
   // Depends on gain_control_ and
-  // public_submodules_->gain_control_for_new_agc.
+  // public_submodules_->gain_control_for_experimental_agc.
   private_submodules_->agc_manager.reset();
   // Depends on gain_control_.
-  public_submodules_->gain_control_for_new_agc.reset();
+  public_submodules_->gain_control_for_experimental_agc.reset();
   while (!private_submodules_->component_list.empty()) {
     ProcessingComponent* component =
         private_submodules_->component_list.front();
@@ -759,7 +696,7 @@
 
   AudioBuffer* ca = capture_.capture_audio.get();  // For brevity.
 
-  if (constants_.use_new_agc &&
+  if (constants_.use_experimental_agc &&
       public_submodules_->gain_control->is_enabled()) {
     private_submodules_->agc_manager->AnalyzePreProcess(
         ca->channels()[0], ca->num_channels(),
@@ -796,7 +733,7 @@
       public_submodules_->echo_control_mobile->ProcessCaptureAudio(ca));
   public_submodules_->voice_detection->ProcessCaptureAudio(ca);
 
-  if (constants_.use_new_agc &&
+  if (constants_.use_experimental_agc &&
       public_submodules_->gain_control->is_enabled() &&
       (!capture_nonlocked_.beamformer_enabled ||
        private_submodules_->beamformer->is_target_present())) {
@@ -998,7 +935,7 @@
   RETURN_ON_ERR(public_submodules_->echo_cancellation->ProcessRenderAudio(ra));
   RETURN_ON_ERR(
       public_submodules_->echo_control_mobile->ProcessRenderAudio(ra));
-  if (!constants_.use_new_agc) {
+  if (!constants_.use_experimental_agc) {
     RETURN_ON_ERR(public_submodules_->gain_control->ProcessRenderAudio(ra));
   }
 
@@ -1164,8 +1101,8 @@
 GainControl* AudioProcessingImpl::gain_control() const {
   // Adding a lock here has no effect as it allows any access to the submodule
   // from the returned pointer.
-  if (constants_.use_new_agc) {
-    return public_submodules_->gain_control_for_new_agc.get();
+  if (constants_.use_experimental_agc) {
+    return public_submodules_->gain_control_for_experimental_agc.get();
   }
   return public_submodules_->gain_control;
 }
@@ -1284,11 +1221,11 @@
 }
 
 void AudioProcessingImpl::InitializeExperimentalAgc() {
-  if (constants_.use_new_agc) {
+  if (constants_.use_experimental_agc) {
     if (!private_submodules_->agc_manager.get()) {
       private_submodules_->agc_manager.reset(new AgcManagerDirect(
           public_submodules_->gain_control,
-          public_submodules_->gain_control_for_new_agc.get(),
+          public_submodules_->gain_control_for_experimental_agc.get(),
           constants_.agc_startup_min_volume));
     }
     private_submodules_->agc_manager->Initialize();
@@ -1519,7 +1456,7 @@
       static_cast<int>(public_submodules_->gain_control->mode()));
   config.set_agc_limiter_enabled(
       public_submodules_->gain_control->is_limiter_enabled());
-  config.set_noise_robust_agc_enabled(constants_.use_new_agc);
+  config.set_noise_robust_agc_enabled(constants_.use_experimental_agc);
 
   config.set_hpf_enabled(public_submodules_->high_pass_filter->is_enabled());
 
diff --git a/webrtc/modules/audio_processing/audio_processing_impl.h b/webrtc/modules/audio_processing/audio_processing_impl.h
index a19d3fc..b3f43fa 100644
--- a/webrtc/modules/audio_processing/audio_processing_impl.h
+++ b/webrtc/modules/audio_processing/audio_processing_impl.h
@@ -274,14 +274,14 @@
   // APM constants.
   const struct ApmConstants {
     ApmConstants(int agc_startup_min_volume,
-                 bool use_new_agc,
+                 bool use_experimental_agc,
                  bool intelligibility_enabled)
         :  // Format of processing streams at input/output call sites.
           agc_startup_min_volume(agc_startup_min_volume),
-          use_new_agc(use_new_agc),
+          use_experimental_agc(use_experimental_agc),
           intelligibility_enabled(intelligibility_enabled) {}
     int agc_startup_min_volume;
-    bool use_new_agc;
+    bool use_experimental_agc;
     bool intelligibility_enabled;
   } constants_;
 
diff --git a/webrtc/modules/audio_processing/audio_processing_impl_locking_unittest.cc b/webrtc/modules/audio_processing/audio_processing_impl_locking_unittest.cc
index 2e22b2c..7ce6a56 100644
--- a/webrtc/modules/audio_processing/audio_processing_impl_locking_unittest.cc
+++ b/webrtc/modules/audio_processing/audio_processing_impl_locking_unittest.cc
@@ -600,7 +600,6 @@
                 (test_config_->aec_type ==
                  AecType::BasicWebRtcAecSettingsWithAecMobile));
   EXPECT_TRUE(apm_->gain_control()->is_enabled());
-  apm_->gain_control()->stream_analog_level();
   EXPECT_TRUE(apm_->noise_suppression()->is_enabled());
 
   // The below return values are not testable.
@@ -713,9 +712,12 @@
   // Prepare a proper capture side processing API call input.
   PrepareFrame();
 
-  // Set the stream delay
+  // Set the stream delay.
   apm_->set_stream_delay_ms(30);
 
+  // Set the analog level.
+  apm_->gain_control()->set_stream_analog_level(80);
+
   // Call the specified capture side API processing method.
   int result = AudioProcessing::kNoError;
   switch (test_config_->capture_api_function) {
@@ -738,6 +740,9 @@
       FAIL();
   }
 
+  // Retrieve the new analog level.
+  apm_->gain_control()->stream_analog_level();
+
   // Check the return code for error.
   ASSERT_EQ(AudioProcessing::kNoError, result);
 }
diff --git a/webrtc/modules/audio_processing/gain_control_for_experimental_agc.cc b/webrtc/modules/audio_processing/gain_control_for_experimental_agc.cc
new file mode 100644
index 0000000..2ef88c0
--- /dev/null
+++ b/webrtc/modules/audio_processing/gain_control_for_experimental_agc.cc
@@ -0,0 +1,104 @@
+/*
+ *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "webrtc/modules/audio_processing/gain_control_for_experimental_agc.h"
+
+#include "webrtc/base/checks.h"
+#include "webrtc/base/criticalsection.h"
+#include "webrtc/modules/audio_processing/include/audio_processing.h"
+
+namespace webrtc {
+
+GainControlForExperimentalAgc::GainControlForExperimentalAgc(
+    GainControl* gain_control,
+    rtc::CriticalSection* crit_capture)
+    : real_gain_control_(gain_control),
+      volume_(0),
+      crit_capture_(crit_capture) {}
+
+int GainControlForExperimentalAgc::Enable(bool enable) {
+  return real_gain_control_->Enable(enable);
+}
+
+bool GainControlForExperimentalAgc::is_enabled() const {
+  return real_gain_control_->is_enabled();
+}
+
+int GainControlForExperimentalAgc::set_stream_analog_level(int level) {
+  rtc::CritScope cs_capture(crit_capture_);
+  volume_ = level;
+  return AudioProcessing::kNoError;
+}
+
+int GainControlForExperimentalAgc::stream_analog_level() {
+  rtc::CritScope cs_capture(crit_capture_);
+  return volume_;
+}
+
+int GainControlForExperimentalAgc::set_mode(Mode mode) {
+  return AudioProcessing::kNoError;
+}
+
+GainControl::Mode GainControlForExperimentalAgc::mode() const {
+  return GainControl::kAdaptiveAnalog;
+}
+
+int GainControlForExperimentalAgc::set_target_level_dbfs(int level) {
+  return AudioProcessing::kNoError;
+}
+
+int GainControlForExperimentalAgc::target_level_dbfs() const {
+  return real_gain_control_->target_level_dbfs();
+}
+
+int GainControlForExperimentalAgc::set_compression_gain_db(int gain) {
+  return AudioProcessing::kNoError;
+}
+
+int GainControlForExperimentalAgc::compression_gain_db() const {
+  return real_gain_control_->compression_gain_db();
+}
+
+int GainControlForExperimentalAgc::enable_limiter(bool enable) {
+  return AudioProcessing::kNoError;
+}
+
+bool GainControlForExperimentalAgc::is_limiter_enabled() const {
+  return real_gain_control_->is_limiter_enabled();
+}
+
+int GainControlForExperimentalAgc::set_analog_level_limits(int minimum,
+                                                           int maximum) {
+  return AudioProcessing::kNoError;
+}
+
+int GainControlForExperimentalAgc::analog_level_minimum() const {
+  return real_gain_control_->analog_level_minimum();
+}
+
+int GainControlForExperimentalAgc::analog_level_maximum() const {
+  return real_gain_control_->analog_level_maximum();
+}
+
+bool GainControlForExperimentalAgc::stream_is_saturated() const {
+  return real_gain_control_->stream_is_saturated();
+}
+
+void GainControlForExperimentalAgc::SetMicVolume(int volume) {
+  rtc::CritScope cs_capture(crit_capture_);
+  volume_ = volume;
+}
+
+int GainControlForExperimentalAgc::GetMicVolume() {
+  rtc::CritScope cs_capture(crit_capture_);
+  return volume_;
+}
+
+}  // namespace webrtc
diff --git a/webrtc/modules/audio_processing/gain_control_for_experimental_agc.h b/webrtc/modules/audio_processing/gain_control_for_experimental_agc.h
new file mode 100644
index 0000000..4fbd05c
--- /dev/null
+++ b/webrtc/modules/audio_processing/gain_control_for_experimental_agc.h
@@ -0,0 +1,70 @@
+/*
+ *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_MODULES_AUDIO_PROCESSING_GAIN_CONTROL_FOR_EXPERIMENTAL_AGC_H_
+#define WEBRTC_MODULES_AUDIO_PROCESSING_GAIN_CONTROL_FOR_EXPERIMENTAL_AGC_H_
+
+#include "webrtc/base/constructormagic.h"
+#include "webrtc/base/criticalsection.h"
+#include "webrtc/base/thread_checker.h"
+#include "webrtc/modules/audio_processing/agc/agc_manager_direct.h"
+#include "webrtc/modules/audio_processing/include/audio_processing.h"
+
+namespace webrtc {
+
+// This class has two main purposes:
+//
+// 1) It is returned instead of the real GainControl after the new AGC has been
+//    enabled in order to prevent an outside user from overriding compression
+//    settings. It doesn't do anything in its implementation, except for
+//    delegating the const methods and Enable calls to the real GainControl, so
+//    AGC can still be disabled.
+//
+// 2) It is injected into AgcManagerDirect and implements volume callbacks for
+//    getting and setting the volume level. It just caches this value to be used
+//    in VoiceEngine later.
+class GainControlForExperimentalAgc : public GainControl,
+                                      public VolumeCallbacks {
+ public:
+  explicit GainControlForExperimentalAgc(GainControl* gain_control,
+                                         rtc::CriticalSection* crit_capture);
+
+  // GainControl implementation.
+  int Enable(bool enable) override;
+  bool is_enabled() const override;
+  int set_stream_analog_level(int level) override;
+  int stream_analog_level() override;
+  int set_mode(Mode mode) override;
+  Mode mode() const override;
+  int set_target_level_dbfs(int level) override;
+  int target_level_dbfs() const override;
+  int set_compression_gain_db(int gain) override;
+  int compression_gain_db() const override;
+  int enable_limiter(bool enable) override;
+  bool is_limiter_enabled() const override;
+  int set_analog_level_limits(int minimum, int maximum) override;
+  int analog_level_minimum() const override;
+  int analog_level_maximum() const override;
+  bool stream_is_saturated() const override;
+
+  // VolumeCallbacks implementation.
+  void SetMicVolume(int volume) override;
+  int GetMicVolume() override;
+
+ private:
+  GainControl* real_gain_control_;
+  int volume_;
+  rtc::CriticalSection* crit_capture_;
+  RTC_DISALLOW_COPY_AND_ASSIGN(GainControlForExperimentalAgc);
+};
+
+}  // namespace webrtc
+
+#endif  // WEBRTC_MODULES_AUDIO_PROCESSING_GAIN_CONTROL_FOR_EXPERIMENTAL_AGC_H_