Provide a mechanism for the GCM driver to send message receipts to GCM.

components/gcm_driver/gcm_driver_android.h

 // Copyright 2014 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 COMPONENTS_GCM_DRIVER_GCM_DRIVER_ANDROID_H
 #define COMPONENTS_GCM_DRIVER_GCM_DRIVER_ANDROID_H
 
 #include <jni.h>
 
 #include "base/android/scoped_java_ref.h"
@@ skipping 79 matching lines @@
   void UnregisterWithSenderIdImpl(const std::string& app_id,
                                   const std::string& sender_id) override;
   void SendImpl(const std::string& app_id,
                 const std::string& receiver_id,
                 const OutgoingMessage& message) override;
   void RecordDecryptionFailure(const std::string& app_id,
                                GCMEncryptionProvider::DecryptionResult result)
       override;
 
  private:
+  void SendMessageReceipt(GCMMessageStatus status);
+  void DoSendMessageReceipt(const MessageReceiptCallback& callback,
+                            GCMMessageSatus status);

[Peter Beverloo, 2017/02/08 17:09:09]

nit: this won't compile (missing `override`). I hope we can merge these two
methods in either case.

[harkness, 2017/02/09 16:27:30]

Weird that this one isn't included in the components_unitttests target.

+
   base::android::ScopedJavaGlobalRef<jobject> java_ref_;
 
   // Callback for GetGCMStatistics.
   GetGCMStatisticsCallback get_gcm_statistics_callback_;
 
   // Recorder that logs GCM activities.
   GCMStatsRecorderAndroid recorder_;
 
   DISALLOW_COPY_AND_ASSIGN(GCMDriverAndroid);
 };
 
 }  // namespace gcm
 
 #endif  // COMPONENTS_GCM_DRIVER_GCM_DRIVER_ANDROID_H