Adding microphone volume support to chrome.

media/audio/fake_audio_input_stream.cc

Index: media/audio/fake_audio_input_stream.cc
diff --git a/media/audio/fake_audio_input_stream.cc b/media/audio/fake_audio_input_stream.cc
index f0f5c258381c9c426b83240423426e44a12f2ed0..b9b271ba670187f723a27fdfe614a24d9bd81ce3 100644
--- a/media/audio/fake_audio_input_stream.cc
+++ b/media/audio/fake_audio_input_stream.cc
@@ -77,3 +77,13 @@ void FakeAudioInputStream::Close() {
   }
   Release();  // Destoys this object.
 }
+
+double FakeAudioInputStream::GetMaxVolume() {
+  return 0.0;
+}
+
+void FakeAudioInputStream::SetVolume(double volume) {}
+
+double FakeAudioInputStream::GetVolume() {
+  return 0.0;
+}