Add polling and audio check to copresence.

components/copresence/handlers/audio/audio_directive_handler.h

 // Copyright 2014 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 COMPONENTS_COPRESENCE_HANDLERS_AUDIO_AUDIO_DIRECTIVE_HANDLER_H_
 #define COMPONENTS_COPRESENCE_HANDLERS_AUDIO_AUDIO_DIRECTIVE_HANDLER_H_
 
 #include <string>
 
 #include "components/copresence/mediums/audio/audio_manager.h"
 #include "components/copresence/public/copresence_constants.h"
 
 namespace base {
 class TimeDelta;
 }
 
 namespace copresence {
 
 class TokenInstruction;
+class WhispernetClient;
 
 // The AudioDirectiveHandler handles audio transmit and receive instructions.
 class AudioDirectiveHandler {
  public:
   virtual ~AudioDirectiveHandler() {}
 
   // Do not use this class before calling this.
-  virtual void Initialize(
-      const AudioManager::DecodeSamplesCallback& decode_cb,
-      const AudioManager::EncodeTokenCallback& encode_cb) = 0;
+  virtual void Initialize(WhispernetClient* whispernet_client,
+                          const TokensCallback& tokens_cb) = 0;
 
   // Adds an instruction to our handler. The instruction will execute and be
   // removed after the ttl expires.
   virtual void AddInstruction(const TokenInstruction& instruction,
                               const std::string& op_id,
                               base::TimeDelta ttl_ms) = 0;
 
   // Removes all instructions associated with this operation id.
   virtual void RemoveInstructions(const std::string& op_id) = 0;
 
   // Returns the currently playing token.
   virtual const std::string PlayingToken(AudioType type) const = 0;
+
+  // Returns if we have heard the currently playing audio token.
+  virtual bool IsPlayingTokenHeard(AudioType type) const = 0;
 };
 
 }  // namespace copresence
 
 #endif  // COMPONENTS_COPRESENCE_HANDLERS_AUDIO_AUDIO_DIRECTIVE_HANDLER_H_