Fix problem when we did not play beginning of HTML5 audio stream in low latency mode.

content/browser/renderer_host/media/audio_sync_reader.h

 // Copyright (c) 2011 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 CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_SYNC_READER_H_
 #define CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_SYNC_READER_H_
 #pragma once
 
 #include "base/file_descriptor_posix.h"
 #include "base/process.h"
@@ skipping 12 matching lines @@
 class AudioSyncReader : public media::AudioOutputController::SyncReader {
  public:
   explicit AudioSyncReader(base::SharedMemory* shared_memory);
 
   virtual ~AudioSyncReader();
 
   // media::AudioOutputController::SyncReader implementations.
   virtual void UpdatePendingBytes(uint32 bytes);
   virtual uint32 Read(void* data, uint32 size);
   virtual void Close();
+  virtual bool DataReady();
 
   bool Init();
   bool PrepareForeignSocketHandle(base::ProcessHandle process_handle,
 #if defined(OS_WIN)
                                   base::SyncSocket::Handle* foreign_handle);
 #else
                                   base::FileDescriptor* foreign_handle);
 #endif
 
  private:
   base::SharedMemory* shared_memory_;
   base::Time previous_call_time_;
 
   // A pair of SyncSocket for transmitting audio data.
   scoped_ptr<base::SyncSocket> socket_;
 
   // SyncSocket to be used by the renderer. The reference is released after
   // PrepareForeignSocketHandle() is called and ran successfully.
   scoped_ptr<base::SyncSocket> foreign_socket_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioSyncReader);
 };
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_SYNC_READER_H_