Add polling and audio check to copresence.

components/copresence/public/copresence_delegate.h

Index: components/copresence/public/copresence_delegate.h
diff --git a/components/copresence/public/copresence_delegate.h b/components/copresence/public/copresence_delegate.h
index 64371d564d123cb6d73cba0ed46216f6fb8dc2c1..3a7aca65f0d0733ca58fed372b3461f25d0000f3 100644
--- a/components/copresence/public/copresence_delegate.h
+++ b/components/copresence/public/copresence_delegate.h
@@ -19,7 +19,9 @@ namespace copresence {
 class Message;
 class WhispernetClient;
 
-enum CopresenceStatus { SUCCESS, FAIL };
+// AUDIO_FAIL indicates that we weren't able to hear the audio token that
+// we were playing.
+enum CopresenceStatus { SUCCESS, FAIL, AUDIO_FAIL };
 
 // Callback type to send a status.
 typedef base::Callback<void(CopresenceStatus)> StatusCallback;
@@ -36,6 +38,8 @@ class CopresenceDelegate {
       const std::string& subscription_id,
       const std::vector<Message>& message) = 0;
 
+  virtual void HandleStatusUpdate(CopresenceStatus status) = 0;
+
   // Thw URLRequestContextGetter must outlive the CopresenceManager.
   virtual net::URLRequestContextGetter* GetRequestContext() const = 0;