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

google_apis/gcm/engine/connection_event_tracker.h

 // Copyright 2016 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 GOOGLE_APIS_GCM_ENGINE_CONNECTION_EVENT_TRACKER_H_
 #define GOOGLE_APIS_GCM_ENGINE_CONNECTION_EVENT_TRACKER_H_
 
 #include <stdint.h>
 
 #include <deque>
 
 #include "base/macros.h"
 #include "google_apis/gcm/base/gcm_export.h"
 #include "google_apis/gcm/protocol/mcs.pb.h"
 #include "net/base/net_errors.h"
 
 namespace gcm {
 
 class GCM_EXPORT ConnectionEventTracker {
  public:
   // TODO(harkness): Pass in the storage information.
   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();
 
   // Ends the record for a connection attempt and moves it to the completed
   // connections list.
   void EndConnectionAttempt();
 
   // Record that the existing connection attempt has succeeded. Note that this
   // doesn't mean the connection is necessarily valid. It could still fail with
@@ skipping 19 matching lines @@
   // Number of events which were discarded due to exceeding the total number of
   // events collected. This is sent to GCM to represent those events.
   uint32_t number_discarded_events_ = 0;
 
   DISALLOW_COPY_AND_ASSIGN(ConnectionEventTracker);
 };
 
 }  // namespace gcm
 
 #endif  // GOOGLE_APIS_GCM_ENGINE_CONNECTION_EVENT_TRACKER_H_