Android: enable/disable WebRTC HW H264 with a flag.

media/base/android/media_codec_util.cc

Index: media/base/android/media_codec_util.cc
diff --git a/media/base/android/media_codec_util.cc b/media/base/android/media_codec_util.cc
index e507936f4f8e7c9bfce91189cb72e3b060c3788c..8a74ae9a58f6256fa4e657689a077294fc585a2a 100644
--- a/media/base/android/media_codec_util.cc
+++ b/media/base/android/media_codec_util.cc
@@ -87,6 +87,12 @@ static bool IsDecoderSupportedByDevice(const std::string& android_mime_type) {
   return Java_MediaCodecUtil_isDecoderSupportedForDevice(env, j_mime);
 }
 
+static bool IsH264EncoderSupported() {

[watk, 2016/10/01 01:06:54]

I would mirror IsDecoderSupportedByDevice and call this
IsEncoderSupportedByDevice 

[braveyao, 2016/10/03 23:50:15]

Done.

+  DCHECK(MediaCodecUtil::IsMediaCodecAvailable());
+  JNIEnv* env = AttachCurrentThread();
+  return Java_MediaCodecUtil_isH264EncoderSupported(env);
+}
+
 // static
 bool MediaCodecUtil::IsMediaCodecAvailable() {
   // MediaCodec is only available on JB and greater.
@@ -211,6 +217,11 @@ bool MediaCodecUtil::IsVp9DecoderAvailable() {
 }
 
 // static
+bool MediaCodecUtil::IsH264EncoderAvailable() {
+  return IsMediaCodecAvailable() && IsH264EncoderSupported();
+}
+
+// static
 bool MediaCodecUtil::IsSurfaceViewOutputSupported() {
   // Disable SurfaceView output for the Samsung Galaxy S3; it does not work
   // well enough for even 360p24 H264 playback.  http://crbug.com/602870.