[GCM] Add app handler support for connection events

components/gcm_driver/gcm_client.h

Index: components/gcm_driver/gcm_client.h
diff --git a/components/gcm_driver/gcm_client.h b/components/gcm_driver/gcm_client.h
index 10f9a995f909d823c16d0f40e9ef7bee6703e20f..34db163a607c71f7ab8924a1c61e27761fd7f9ac 100644
--- a/components/gcm_driver/gcm_client.h
+++ b/components/gcm_driver/gcm_client.h
@@ -15,12 +15,15 @@
 
 template <class T> class scoped_refptr;
 
+class GURL;
+
 namespace base {
 class FilePath;
 class SequencedTaskRunner;
 }
 
 namespace net {
+class IPEndPoint;
 class URLRequestContextGetter;
 }
 
@@ -189,6 +192,13 @@ class GCMClient {
     // Called when activities are being recorded and a new activity has just
     // been recorded.
     virtual void OnActivityRecorded() = 0;
+
+    // Called when a new connection is established and a successful handshake
+    // has been performed.
+    virtual void OnConnected(const net::IPEndPoint& ip_endpoint) = 0;
+
+    // Called when the connection is interrupted.
+    virtual void OnDisconnected() = 0;
   };
 
   GCMClient();