Refactor FakeAudioDevice to have separate methods for starting recording and playout.

webrtc/test/call_test.cc

Index: webrtc/test/call_test.cc
diff --git a/webrtc/test/call_test.cc b/webrtc/test/call_test.cc
index 9521d3430d3fee35da27093961001f377f2f29a4..8d1f4f1bf5ee362177944a942888ff83576cceb0 100644
--- a/webrtc/test/call_test.cc
+++ b/webrtc/test/call_test.cc
@@ -140,14 +140,14 @@ void CallTest::Start() {
   for (VideoReceiveStream* video_recv_stream : video_receive_streams_)
     video_recv_stream->Start();
   if (audio_send_stream_) {
-    fake_send_audio_device_->Start();
+    fake_send_audio_device_->StartRecordingSine(1000, 256);
     audio_send_stream_->Start();
     EXPECT_EQ(0, voe_send_.base->StartSend(voe_send_.channel_id));
   }
   for (AudioReceiveStream* audio_recv_stream : audio_receive_streams_)
     audio_recv_stream->Start();
   if (!audio_receive_streams_.empty()) {
-    fake_recv_audio_device_->Start();
+    fake_recv_audio_device_->StartPlayout();
     EXPECT_EQ(0, voe_recv_.base->StartPlayout(voe_recv_.channel_id));
   }
   for (FlexfecReceiveStream* flexfec_recv_stream : flexfec_receive_streams_)
@@ -162,13 +162,13 @@ void CallTest::Stop() {
   for (FlexfecReceiveStream* flexfec_recv_stream : flexfec_receive_streams_)
     flexfec_recv_stream->Stop();
   if (!audio_receive_streams_.empty()) {
-    fake_recv_audio_device_->Stop();
+    fake_recv_audio_device_->StopPlayout();
     EXPECT_EQ(0, voe_recv_.base->StopPlayout(voe_recv_.channel_id));
   }
   for (AudioReceiveStream* audio_recv_stream : audio_receive_streams_)
     audio_recv_stream->Stop();
   if (audio_send_stream_) {
-    fake_send_audio_device_->Stop();
+    fake_send_audio_device_->StopRecording();
     EXPECT_EQ(0, voe_send_.base->StopSend(voe_send_.channel_id));
     audio_send_stream_->Stop();
   }
@@ -309,12 +309,10 @@ void CallTest::CreateFrameGeneratorCapturer(int framerate,
 }
 
 void CallTest::CreateFakeAudioDevices() {
-  fake_send_audio_device_.reset(new FakeAudioDevice(
-      clock_, test::ResourcePath("voice_engine/audio_long16", "pcm"),
-      DriftingClock::kNoDrift));
-  fake_recv_audio_device_.reset(new FakeAudioDevice(
-      clock_, test::ResourcePath("voice_engine/audio_long16", "pcm"),
-      DriftingClock::kNoDrift));
+  fake_send_audio_device_.reset(
+      new FakeAudioDevice(clock_, DriftingClock::kNoDrift));
+  fake_recv_audio_device_.reset(
+      new FakeAudioDevice(clock_, DriftingClock::kNoDrift));
 }
 
 void CallTest::CreateVideoStreams() {