[experimental] MR: add support for H264 recording

content/renderer/media/media_recorder_handler.cc

Index: content/renderer/media/media_recorder_handler.cc
diff --git a/content/renderer/media/media_recorder_handler.cc b/content/renderer/media/media_recorder_handler.cc
index 0beedc394745310459719b71055efe2751366f60..4b6dc17a507ea44987e3c32676a6d7e7dbf93a85 100644
--- a/content/renderer/media/media_recorder_handler.cc
+++ b/content/renderer/media/media_recorder_handler.cc
@@ -63,9 +63,9 @@ bool MediaRecorderHandler::canSupportMimeType(
     return false;
 
   // Both |video| and |audio| support empty |codecs|; |type| == "video" supports
-  // vp8, vp9 or opus; |type| = "audio", supports only opus.
+  // vp8, vp9, h264 or opus; |type| = "audio", supports only opus.
   // http://www.webmproject.org/docs/container Sec:"HTML5 Video Type Parameters"
-  static const char* const kVideoCodecs[] = { "vp8", "vp9", "opus" };
+  static const char* const kVideoCodecs[] = { "vp8", "vp9", "opus", "h264" };
   static const char* const kAudioCodecs[] = { "opus" };
   const char* const* codecs = video ? &kVideoCodecs[0] : &kAudioCodecs[0];
   int codecs_count =  video ? arraysize(kVideoCodecs) : arraysize(kAudioCodecs);
@@ -101,6 +101,10 @@ bool MediaRecorderHandler::initialize(
     return false;
   }
   use_vp9_ = base::ToLowerASCII(codecs.utf8()).find("vp9") != std::string::npos;
+  use_h264_ = base::ToLowerASCII(codecs.utf8()).find("h264") != std::string::npos;
+
+  use_h264_ = true;
+
   media_stream_ = media_stream;
   DCHECK(client);
   client_ = client;
@@ -146,7 +150,10 @@ bool MediaRecorderHandler::start(int timeslice) {
                                     blink::WebMediaStreamSource::ReadyStateLive;
 
   webm_muxer_.reset(new media::WebmMuxer(
-      use_vp9_ ? media::kCodecVP9 : media::kCodecVP8, use_video_tracks,
+
+      use_h264_
+          ? media::kCodecH264
+          : (use_vp9_ ? media::kCodecVP9 : media::kCodecVP8), use_video_tracks,
       use_audio_tracks, base::Bind(&MediaRecorderHandler::WriteData,
                                    weak_factory_.GetWeakPtr())));
 
@@ -164,8 +171,12 @@ bool MediaRecorderHandler::start(int timeslice) {
         media::BindToCurrentLoop(base::Bind(
             &MediaRecorderHandler::OnEncodedVideo, weak_factory_.GetWeakPtr()));
 
+    const VideoTrackRecorder::CodecId codec =
+        use_h264_ ? VideoTrackRecorder::CodecId::H264
+                  : (use_vp9_ ? VideoTrackRecorder::CodecId::VP9
+                              : VideoTrackRecorder::CodecId::VP8);
     video_recorders_.push_back(new VideoTrackRecorder(
-        use_vp9_, video_track, on_encoded_video_cb, video_bits_per_second_));
+        codec, video_track, on_encoded_video_cb, video_bits_per_second_));
   }
 
   if (use_audio_tracks) {