MediaStream audio sourcing: Bypass audio processing for non-WebRTC cases.

content/shell/renderer/layout_test/blink_test_runner.cc

Index: content/shell/renderer/layout_test/blink_test_runner.cc
diff --git a/content/shell/renderer/layout_test/blink_test_runner.cc b/content/shell/renderer/layout_test/blink_test_runner.cc
index f6f74c58bd300ea99351dc4598e8658345eae7dd..ff0d3333764c31a3be7ef6ac3491f922f2327a09 100644
--- a/content/shell/renderer/layout_test/blink_test_runner.cc
+++ b/content/shell/renderer/layout_test/blink_test_runner.cc
@@ -794,7 +794,9 @@ bool BlinkTestRunner::AddMediaStreamAudioSourceAndTrack(
 #if defined(ENABLE_WEBRTC)
   return AddAudioTrackToMediaStream(
       make_scoped_refptr(new MockAudioCapturerSource()),
-      false /* is_remote */, false /* is_readonly */, stream);
+      48000 /* sample rate */, media::CHANNEL_LAYOUT_STEREO,
+      480 /* sample frames per buffer */, false /* is_remote */,
+      false /* is_readonly */, stream);
 #else
   return false;
 #endif