Allow MediaStream constraints to specify higher than 30 FPS tab capture.

content/renderer/media/webrtc/video_destination_handler.cc

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/renderer/media/webrtc/video_destination_handler.h"
 
 #include <string>
 
 #include "base/base64.h"
 #include "base/logging.h"
@@ skipping 65 matching lines @@
   DVLOG(3) << "PpFrameWriter ctor";
 }
 
 PpFrameWriter::~PpFrameWriter() {
   DVLOG(3) << "PpFrameWriter dtor";
 }
 
 void PpFrameWriter::GetCurrentSupportedFormats(
     int max_requested_width,
     int max_requested_height,
+    double max_requested_frame_rate,
     const VideoCaptureDeviceFormatsCB& callback) {
   DCHECK(CalledOnValidThread());
   DVLOG(3) << "PpFrameWriter::GetCurrentSupportedFormats()";
   // Since the input is free to change the resolution at any point in time
   // the supported formats are unknown.
   media::VideoCaptureFormats formats;
   callback.Run(formats);
 }
 
 void PpFrameWriter::StartSourceImpl(
@@ skipping 130 matching lines @@
 
   stream.addTrack(MediaStreamVideoTrack::CreateVideoTrack(
       writer, constraints, MediaStreamVideoSource::ConstraintsCallback(),
       track_enabled));
 
   *frame_writer = new PpFrameWriterProxy(writer->AsWeakPtr());
   return true;
 }
 
 }  // namespace content