Reland of Add full stack tests for MediaCodec.

test/call_test.h

Index: test/call_test.h
diff --git a/test/call_test.h b/test/call_test.h
index cf15aacf114a6d7ac0fba35329d2585191f52938..238539c6adba1ac2bf6a87de78110b40faaea157 100644
--- a/test/call_test.h
+++ b/test/call_test.h
@@ -133,8 +133,8 @@
   size_t num_video_streams_;
   size_t num_audio_streams_;
   size_t num_flexfec_streams_;
-  rtc::scoped_refptr<AudioDecoderFactory> decoder_factory_;
-  rtc::scoped_refptr<AudioEncoderFactory> encoder_factory_;
+  rtc::scoped_refptr<AudioDecoderFactory> audio_decoder_factory_;
+  rtc::scoped_refptr<AudioEncoderFactory> audio_encoder_factory_;
   test::FakeVideoRenderer fake_renderer_;
 
   SingleThreadedTaskQueueForTesting task_queue_;