MediaRecorder: support |timecode| and remove |m_ignoreMutedMedia|.

third_party/WebKit/public/platform/WebMediaRecorderHandlerClient.h

 // Copyright 2015 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.
 
 #ifndef WebMediaRecorderHandlerClient_h
 #define WebMediaRecorderHandlerClient_h
 
 #include "WebCommon.h"
 
 namespace blink {
 
 class WebString;
 
 // Interface used by a MediaRecorder to get errors and recorded data delivered.
 class WebMediaRecorderHandlerClient {
  public:
-  virtual void writeData(const char* data, size_t length, bool lastInslice) = 0;
+  virtual void writeData(const char* data,
+                         size_t length,
+                         bool lastInslice,
+                         double timecode) = 0;
 
   virtual void onError(const WebString& message) = 0;
 };
 
 }  // namespace blink
 
 #endif  // WebMediaRecorderHandlerClient_h