Increase the threshold for RunPlayoutAndRecordingInFullDuplex.

RunPlayoutAndRecordingInFullDuplex fails sometimes on Android swarming
bots, presumably because the timing is hardware dependent.

This test ensures that audio starts pumping. The exact performance is
not that important.

R=kjellander@webrtc.org, henrika@webrtc.org
BUG=webrtc:6464
NOTRY=True

Review-Url: https://codereview.webrtc.org/2391563002
Cr-Commit-Position: refs/heads/master@{#14492}
diff --git a/webrtc/modules/audio_device/android/audio_device_unittest.cc b/webrtc/modules/audio_device/android/audio_device_unittest.cc
index 56fb209..eefab0f 100644
--- a/webrtc/modules/audio_device/android/audio_device_unittest.cc
+++ b/webrtc/modules/audio_device/android/audio_device_unittest.cc
@@ -1020,8 +1020,12 @@
                                1000 * kFullDuplexTimeInSec));
   StopPlayout();
   StopRecording();
-  EXPECT_LE(fifo_audio_stream->average_size(), 10u);
-  EXPECT_LE(fifo_audio_stream->largest_size(), 20u);
+
+  // These thresholds are set rather high to accomodate differences in hardware
+  // in several devices, so this test can be used in swarming.
+  // See http://bugs.webrtc.org/6464
+  EXPECT_LE(fifo_audio_stream->average_size(), 30u);
+  EXPECT_LE(fifo_audio_stream->largest_size(), 40u);
 }
 
 // Measures loopback latency and reports the min, max and average values for