Implement Linux audio capturer.

remoting/host/audio_capturer_win.cc

Index: remoting/host/audio_capturer_win.cc
diff --git a/remoting/host/audio_capturer_win.cc b/remoting/host/audio_capturer_win.cc
index 6479afaad5a453d216cb2614a216d6f822dc3056..90714ac2fd67e2b25f4ac609a8d8ca47931666d0 100644
--- a/remoting/host/audio_capturer_win.cc
+++ b/remoting/host/audio_capturer_win.cc
@@ -199,7 +199,7 @@ bool AudioCapturerWin::Start(const PacketCapturedCallback& callback) {
 
 void AudioCapturerWin::Stop() {
   DCHECK(thread_checker_.CalledOnValidThread());
-  DCHECK(IsRunning());
+  DCHECK(IsStarted());
 
   capture_timer_.reset();
   mm_device_.Release();
@@ -211,7 +211,7 @@ void AudioCapturerWin::Stop() {
   thread_checker_.DetachFromThread();
 }
 
-bool AudioCapturerWin::IsRunning() {
+bool AudioCapturerWin::IsStarted() {
   DCHECK(thread_checker_.CalledOnValidThread());
   return capture_timer_.get() != NULL;
 }
@@ -219,7 +219,7 @@ bool AudioCapturerWin::IsRunning() {
 void AudioCapturerWin::DoCapture() {
   DCHECK(AudioCapturer::IsValidSampleRate(sampling_rate_));
   DCHECK(thread_checker_.CalledOnValidThread());
-  DCHECK(IsRunning());
+  DCHECK(IsStarted());
 
   // Fetch all packets from the audio capture endpoint buffer.
   while (true) {
@@ -279,6 +279,10 @@ bool AudioCapturerWin::IsPacketOfSilence(
   return true;
 }
 
+bool AudioCapturer::IsSupported() {
+  return true;
+}
+
 scoped_ptr<AudioCapturer> AudioCapturer::Create() {
   return scoped_ptr<AudioCapturer>(new AudioCapturerWin());
 }