Add the ability to read/write to WAV files in FakeAudioDevice

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 68d6857e29d7208d85a8af114227b5fb951b25f9..f7750f48188c6bdb5822dfd2932f68bfc8e0068b 100644
--- a/webrtc/test/call_test.cc
+++ b/webrtc/test/call_test.cc
@@ -299,8 +299,10 @@ void CallTest::CreateFrameGeneratorCapturer(int framerate,
 }
 
 void CallTest::CreateFakeAudioDevices() {
-  fake_send_audio_device_.reset(new FakeAudioDevice(1.f, 48000, 256));
-  fake_recv_audio_device_.reset(new FakeAudioDevice(1.f, 48000, 256));
+  fake_send_audio_device_.reset(new FakeAudioDevice(
+      FakeAudioDevice::CreatePulsedNoiseCapturer(256, 48000), nullptr, 1.f));
+  fake_recv_audio_device_.reset(new FakeAudioDevice(
+      nullptr, FakeAudioDevice::CreateDiscardRenderer(48000), 1.f));
 }
 
 void CallTest::CreateVideoStreams() {