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

chrome/browser/services/gcm/fake_gcm_profile_service.cc

Index: chrome/browser/services/gcm/fake_gcm_profile_service.cc
diff --git a/chrome/browser/services/gcm/fake_gcm_profile_service.cc b/chrome/browser/services/gcm/fake_gcm_profile_service.cc
index 185d824581661bc54970e6cec80422f3d0e95f45..cd1c1a8a3fefcedf08b56421e4197a1384ff627e 100644
--- a/chrome/browser/services/gcm/fake_gcm_profile_service.cc
+++ b/chrome/browser/services/gcm/fake_gcm_profile_service.cc
@@ -38,7 +38,8 @@ class CustomFakeGCMDriver : public instance_id::FakeGCMDriverForInstanceID {
                       GCMClient::Result result);
 
   void OnDispatchMessage(const std::string& app_id,
-                         const IncomingMessage& message);
+                         const IncomingMessage& message,
+                         const GCMClient::MessageReceiptCallback& callback);
 
  protected:
   // FakeGCMDriverForInstanceID overrides:
@@ -110,9 +111,11 @@ void CustomFakeGCMDriver::OnSendFinished(const std::string& app_id,
   SendFinished(app_id, message_id, result);
 }
 
-void CustomFakeGCMDriver::OnDispatchMessage(const std::string& app_id,
-                                            const IncomingMessage& message) {
-  DispatchMessage(app_id, message);
+void CustomFakeGCMDriver::OnDispatchMessage(
+    const std::string& app_id,
+    const IncomingMessage& message,
+    const GCMClient::MessageReceiptCallback& callback) {
+  DispatchMessage(app_id, message, callback);
 }
 
 }  // namespace
@@ -194,11 +197,13 @@ void FakeGCMProfileService::SetUnregisterCallback(
   unregister_callback_ = callback;
 }
 
-void FakeGCMProfileService::DispatchMessage(const std::string& app_id,
-                                            const IncomingMessage& message) {
+void FakeGCMProfileService::DispatchMessage(
+    const std::string& app_id,
+    const IncomingMessage& message,
+    const GCMClient::MessageReceiptCallback& callback) {
   CustomFakeGCMDriver* custom_driver =
       static_cast<CustomFakeGCMDriver*>(driver());
-  custom_driver->OnDispatchMessage(app_id, message);
+  custom_driver->OnDispatchMessage(app_id, message, callback);
 }
 
 }  // namespace gcm