Add the copresence DirectiveHandler.

components/copresence/handlers/directive_handler.h

Index: components/copresence/handlers/directive_handler.h
diff --git a/components/copresence/handlers/directive_handler.h b/components/copresence/handlers/directive_handler.h
new file mode 100644
index 0000000000000000000000000000000000000000..8a415f1dbb77cda9b70dfce35cd6ad2550d1e822
--- /dev/null
+++ b/components/copresence/handlers/directive_handler.h
@@ -0,0 +1,42 @@
+// 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_DIRECTIVE_HANDLER_
+#define COMPONENTS_COPRESENCE_HANDLERS_DIRECTIVE_HANDLER_
+
+#include <string>
+
+#include "base/callback.h"
+#include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
+#include "components/copresence/handlers/audio/audio_directive_list.h"
+#include "components/copresence/mediums/audio/audio_recorder.h"
+
+namespace copresence {
+
+class AudioDirectiveHandler;
+class Directive;
+
+// The directive handler manages transmit and receive directives given to it
+// by the client.
+class DirectiveHandler {
+ public:
+  DirectiveHandler(const AudioRecorder::DecodeSamplesCallback& decode_cb,
+                   const AudioDirectiveList::EncodeTokenCallback& encode_cb);
+  ~DirectiveHandler();
+
+  // Adds a directive to handle.
+  void AddDirective(const copresence::Directive& directive);
+  // Removes any directives associated with the given operation id.
+  void RemoveDirectives(const std::string& op_id);
+
+ private:
+  scoped_ptr<AudioDirectiveHandler> audio_handler_;
+
+  DISALLOW_COPY_AND_ASSIGN(DirectiveHandler);
+};
+
+}  // namespace copresence
+
+#endif  // COMPONENTS_COPRESENCE_HANDLERS_DIRECTIVE_HANDLER_