Update ConnectionEventTracker to check if there is an in progress attempt.

google_apis/gcm/engine/connection_event_tracker.h

Index: google_apis/gcm/engine/connection_event_tracker.h
diff --git a/google_apis/gcm/engine/connection_event_tracker.h b/google_apis/gcm/engine/connection_event_tracker.h
index 2e1827379590e6809b9380c8e90464be7a13af41..6c3a54d52d1e430a3329a1bb277dfbbcbed65197 100644
--- a/google_apis/gcm/engine/connection_event_tracker.h
+++ b/google_apis/gcm/engine/connection_event_tracker.h
@@ -22,6 +22,9 @@ class GCM_EXPORT ConnectionEventTracker {
   ConnectionEventTracker();
   ~ConnectionEventTracker();
 
+  // Returns a boolean indicating whether an attempt is currently in progress.
+  bool IsEventInProgress() const;
+
   // Start recording a new connection attempt. This should never be called if
   // a connection attempt is already ongoing.
   void StartConnectionAttempt();