Android: enable H264&VP8 HW accelerator for MediaRecorder

content/renderer/media_recorder/video_track_recorder_unittest.cc

Index: content/renderer/media_recorder/video_track_recorder_unittest.cc
diff --git a/content/renderer/media_recorder/video_track_recorder_unittest.cc b/content/renderer/media_recorder/video_track_recorder_unittest.cc
index 05cd924b4a3b01cbb16a16e35eebf5ad51338658..14f99871dd65f7255535ff6af9cc1dccbd55bbd5 100644
--- a/content/renderer/media_recorder/video_track_recorder_unittest.cc
+++ b/content/renderer/media_recorder/video_track_recorder_unittest.cc
@@ -47,6 +47,8 @@ const VideoTrackRecorder::CodecId kTrackRecorderTestCodec[] = {
     VideoTrackRecorder::CodecId::VP8,
     VideoTrackRecorder::CodecId::VP9
 #if BUILDFLAG(RTC_USE_H264)
+    // This unittest can't enumerate HW codecs due to no render thread created.
+    // So H264 can't be included on Android because OpenH264 is not supported.

[mcasas, 2017/04/19 22:32:46]

This comment is hard to parse, because you're referring to
something that can't happen because something else can't 
(doesn't?) happen either.  Rephrase it in a logical way, e.g.

    // This test case can't be enabled in Android because there is no software
    // OpenH264 fallback nor render thread to enumerate the hardware encoders.

[braveyao, 2017/04/20 18:17:29]

Done.

     , VideoTrackRecorder::CodecId::H264
 #endif
 };