Android: enable H264&VP8 HW accelerator for MediaRecorder

content/renderer/media_recorder/video_track_recorder.h

Index: content/renderer/media_recorder/video_track_recorder.h
diff --git a/content/renderer/media_recorder/video_track_recorder.h b/content/renderer/media_recorder/video_track_recorder.h
index 53a871f32512a7e4a4a23462fa26e568ac1c6fcc..eecce71570d66c3cc40f34219ca86b995ffe5bb4 100644
--- a/content/renderer/media_recorder/video_track_recorder.h
+++ b/content/renderer/media_recorder/video_track_recorder.h
@@ -32,8 +32,18 @@ class VideoFrame;
 }  // namespace media
 
 namespace video_track_recorder {
+#if !defined(OS_ANDROID)

[mcasas, 2017/04/17 20:10:39]

Don't use negative conditionals:

#if defined(OS_ANDROID)
// blabla
#else
// foo foo
#endif

[braveyao, 2017/04/18 16:15:38]

Done.

 const int kVEAEncoderMinResolutionWidth = 640;
 const int kVEAEncoderMinResolutionHeight = 480;
+#else
+// The minimum resolution supported by HW H264 on Android varies on each
+// platform and OS version.
+// Take Nexus 5 as an example, it's:
+// 176x144 on KitKat; 160x120 on Lollipop; 96x64 on Marshmallow and above.
+// Set 176x144 for now and revise it as the target API level changes.

[mcasas, 2017/04/17 20:10:39]

If there's an action for the future, we need a bug
and the usual line TODO(developer):... https://crbug.com/xyzuvw

Also, you say here: 176x144 but the value in l.44-45 is
172x144.

My suggestion here is to make it a conservative estimate, remove
all these superfluous data from the comment, and make the 
minimum dimensions QVGA: 320x240.

[braveyao, 2017/04/18 16:15:38]

Done.
Keeping minimum resolution to QCIF: 176x144

+const int kVEAEncoderMinResolutionWidth = 172;
+const int kVEAEncoderMinResolutionHeight = 144;
+#endif
 }  // namespace video_track_recorder
 
 namespace content {
@@ -51,7 +61,7 @@ class CONTENT_EXPORT VideoTrackRecorder
   enum class CodecId {
     VP8,
     VP9,
-#if BUILDFLAG(RTC_USE_H264)
+#if BUILDFLAG(RTC_USE_H264) || defined(OS_ANDROID)
     H264,
 #endif
     LAST