Added ClientEvent proto and structure for storing events in the factory.

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
new file mode 100644
index 0000000000000000000000000000000000000000..574ecaf5b1479db93ecc2b8d1b9fe28c2eeb7107
--- /dev/null
+++ b/google_apis/gcm/engine/connection_event_tracker.h
@@ -0,0 +1,57 @@
+// 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 <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();
+
+  // 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
+  // an authentication error.
+  void ConnectionAttemptSucceeded();
+
+  // Records that the connection succeeded but then failed to login.
+  void ConnectionLoginFailed();
+
+  // Record that the existing connection attempt has failed.
+  void ConnectionAttemptFailed(int error);
+
+  // Write any previous connection information to the |*login_request|.
+  void WriteToLoginRequest(mcs_proto::LoginRequest* login_request);
+
+ private:
+  // Storage for all the events which have completed.
+  std::deque<mcs_proto::ClientEvent> completed_events_;
+
+  // Current connection attempt.
+  mcs_proto::ClientEvent current_event_;
+
+  DISALLOW_COPY_AND_ASSIGN(ConnectionEventTracker);
+};
+
+}  // namespace gcm
+
+#endif  // GOOGLE_APIS_GCM_ENGINE_CONNECTION_EVENT_TRACKER_H_