Adding support for pre-sent messages

components/copresence/public/copresence_constants.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_PUBLIC_COPRESENCE_CONSTANTS_H_
 #define COMPONENTS_COPRESENCE_PUBLIC_COPRESENCE_CONSTANTS_H_
 
+#include <google/protobuf/repeated_field.h>
+
 #include <string>
 #include <vector>
 
 #include "base/callback_forward.h"
 #include "base/memory/ref_counted.h"
 #include "components/copresence/tokens.h"
 #include "media/base/channel_layout.h"
 
 namespace media {
 class AudioBusRefCounted;
 }
 
 namespace copresence {
 
 class Directive;
+class SubscribedMessage;
 
 // Audio constants. Currently used from the AudioPlayer/AudioRecorder.
 // TODO(rkc): Make these values configurable then remove them from here.
 // Number of repetitions of the audio token in one sequence of samples.
 extern const int kDefaultRepetitions;
 
 // The default sample rate. We need to ensure that both the recorder and the
 // player on _all platforms use the same rate.
 extern const float kDefaultSampleRate;
 extern const int kDefaultBitsPerSample;
@@ skipping 32 matching lines @@
 // const std::string& token: The token that we encoded.
 // const scoped_refptr<media::AudioBusRefCounted>& samples - Encoded samples.
 using SamplesCallback =
     base::Callback<void(AudioType,
                         const std::string&,
                         const scoped_refptr<media::AudioBusRefCounted>&)>;
 
 // Callback to pass a list of directives back to CopresenceState.
 using DirectivesCallback = base::Callback<void(const std::vector<Directive>&)>;
 
+// Callback to pass around a list of SubscribedMessages.
+using MessagesCallback = base::Callback<void(
+    const google::protobuf::RepeatedPtrField<SubscribedMessage>&)>;
+
 }  // namespace copresence
 
 #endif  // COMPONENTS_COPRESENCE_PUBLIC_COPRESENCE_CONSTANTS_H_