Enable audio capture on Android

content/renderer/media/webrtc_audio_capturer.cc

Index: content/renderer/media/webrtc_audio_capturer.cc
===================================================================
--- content/renderer/media/webrtc_audio_capturer.cc	(revision 181622)
+++ content/renderer/media/webrtc_audio_capturer.cc	(working copy)
@@ -52,6 +52,9 @@
   // TODO(henrika): It might be possible to reduce the input buffer
   // size and reduce the delay even more.
   buffer_size = 2 * sample_rate / 100;
+#elif defined(OS_ANDROID)
+  // TODO(leozwang): Tune and adjust buffer size on Android.
+  buffer_size = 2 * sample_rate / 100;

[no longer working on chromium, 2013/02/11 18:20:36]

Have you tested that 20ms buffer size is a good start for Android? 

[leozwang1, 2013/02/11 21:00:48]

In my local loopback test with video, I can still hear some "clipping" noise.

[no longer working on chromium, 2013/02/12 20:04:46]

Then why don't we increase it to a reasonable value? like 50ms, for example.

[leozwang1, 2013/02/12 20:14:17]

Most of tests I have done are video+audio. The next step is to try audio only to
see where the baseline is.

 #endif
 
   return buffer_size;