Cast: Add JS API to get raw events logs from cast extension.

chrome/renderer/media/cast_rtp_stream.cc

Index: chrome/renderer/media/cast_rtp_stream.cc
diff --git a/chrome/renderer/media/cast_rtp_stream.cc b/chrome/renderer/media/cast_rtp_stream.cc
index 4824b5e0e0d2129da79b55638f4332ba79831182..1086c4574ff81c3ecd7becac62acd5a1a517ad13 100644
--- a/chrome/renderer/media/cast_rtp_stream.cc
+++ b/chrome/renderer/media/cast_rtp_stream.cc
@@ -278,7 +278,10 @@ CastRtpParams::~CastRtpParams() {
 
 CastRtpStream::CastRtpStream(const blink::WebMediaStreamTrack& track,
                              const scoped_refptr<CastSession>& session)
-    : track_(track), cast_session_(session), weak_factory_(this) {}
+    : track_(track),
+      cast_session_(session),
+      stream_id_(-1),
+      weak_factory_(this) {}
 
 CastRtpStream::~CastRtpStream() {
 }
@@ -343,6 +346,22 @@ void CastRtpStream::Stop() {
   stop_callback_.Run();
 }
 
+void CastRtpStream::SetStreamId(const int stream_id) {
+  DCHECK(stream_id >= 0);
+  stream_id_ = stream_id;
+}
+
+void CastRtpStream::StartLogging() {
+  DCHECK(stream_id_ >= 0);
+  cast_session_->StartLogging(stream_id_, IsAudio());
+}
+
+void CastRtpStream::GetRawEvents(
+    base::Callback<void(scoped_ptr<std::string>)> callback) {
+  DCHECK(stream_id_ >= 0);
+  cast_session_->GetEventLogsAndReset(callback, stream_id_);
+}
+
 bool CastRtpStream::IsAudio() const {
   return track_.source().type() == blink::WebMediaStreamSource::TypeAudio;
 }