Link GCM heartbeat with wake on wifi preference

google_apis/gcm/engine/mcs_client.h

Index: google_apis/gcm/engine/mcs_client.h
diff --git a/google_apis/gcm/engine/mcs_client.h b/google_apis/gcm/engine/mcs_client.h
index 96c1580e31596276793490a1a9f33b049e82b8e0..6a2fa3de0d563bf6922240b2f1acf9c4f50ff685 100644
--- a/google_apis/gcm/engine/mcs_client.h
+++ b/google_apis/gcm/engine/mcs_client.h
@@ -104,6 +104,10 @@ class GCM_EXPORT MCSClient {
             scoped_ptr<base::Timer> heartbeat_timer);
   virtual ~MCSClient();
 
+  HeartbeatManager* heartbeat_manager() {
+    return &heartbeat_manager_;
+  }
+
   // Initialize the client. Will load any previous id/token information as well
   // as unacknowledged message information from the GCM storage, if it exists,
   // passing the id/token information back via |initialization_callback| along