Update IWYU tool with a mapping file

Also apply IWYU to all .cc files in pc/, and correct BUILD file to match.
Note: Some files came out wrong when iwyu was applied. These are not included.

Bug: none
Change-Id: Ib5ea46b8fcc505414d0447cca7218ad3afc2e321
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/252280
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Commit-Queue: Harald Alvestrand <hta@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#36064}
diff --git a/pc/peer_connection_crypto_unittest.cc b/pc/peer_connection_crypto_unittest.cc
index 394203c..1741b99 100644
--- a/pc/peer_connection_crypto_unittest.cc
+++ b/pc/peer_connection_crypto_unittest.cc
@@ -8,17 +8,47 @@
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
-#include <memory>
+#include <stddef.h>
 
+#include <memory>
+#include <ostream>
+#include <string>
+#include <tuple>
+#include <type_traits>
+#include <utility>
+#include <vector>
+
+#include "absl/types/optional.h"
+#include "api/audio/audio_mixer.h"
 #include "api/audio_codecs/builtin_audio_decoder_factory.h"
 #include "api/audio_codecs/builtin_audio_encoder_factory.h"
 #include "api/create_peerconnection_factory.h"
+#include "api/crypto/crypto_options.h"
+#include "api/crypto_params.h"
+#include "api/jsep.h"
+#include "api/peer_connection_interface.h"
+#include "api/scoped_refptr.h"
 #include "api/video_codecs/builtin_video_decoder_factory.h"
 #include "api/video_codecs/builtin_video_encoder_factory.h"
+#include "modules/audio_device/include/audio_device.h"
+#include "modules/audio_processing/include/audio_processing.h"
 #include "p2p/base/fake_port_allocator.h"
+#include "p2p/base/port_allocator.h"
+#include "p2p/base/transport_description.h"
+#include "p2p/base/transport_info.h"
+#include "pc/media_protocol_names.h"
 #include "pc/media_session.h"
 #include "pc/peer_connection_wrapper.h"
 #include "pc/sdp_utils.h"
+#include "pc/session_description.h"
+#include "pc/test/mock_peer_connection_observers.h"
+#include "rtc_base/checks.h"
+#include "rtc_base/ref_counted_object.h"
+#include "rtc_base/rtc_certificate.h"
+#include "rtc_base/rtc_certificate_generator.h"
+#include "rtc_base/ssl_fingerprint.h"
+#include "rtc_base/thread.h"
+#include "test/gtest.h"
 #ifdef WEBRTC_ANDROID
 #include "pc/test/android_test_initializer.h"
 #endif