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

chrome/browser/services/gcm/fake_gcm_profile_service.h

Index: chrome/browser/services/gcm/fake_gcm_profile_service.h
diff --git a/chrome/browser/services/gcm/fake_gcm_profile_service.h b/chrome/browser/services/gcm/fake_gcm_profile_service.h
index aabba5e5aaf0b6edbfaea1d26afdb41eeda48eb9..7631a93ef1214b543a24c3191f4e90b1a02c3b04 100644
--- a/chrome/browser/services/gcm/fake_gcm_profile_service.h
+++ b/chrome/browser/services/gcm/fake_gcm_profile_service.h
@@ -10,6 +10,7 @@
 #include <vector>
 
 #include "base/macros.h"
+#include "components/gcm_driver/gcm_client.h"

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

note: you'll get some interesting merge conflicts w/
https://codereview.chromium.org/2675293003/

[harkness, 2017/02/09 16:27:29]

Acknowledged.

 #include "components/gcm_driver/gcm_driver.h"
 #include "components/gcm_driver/gcm_profile_service.h"
 
@@ -45,7 +46,8 @@ class FakeGCMProfileService : public GCMProfileService {
   void SetUnregisterCallback(const UnregisterCallback& callback);
 
   void DispatchMessage(const std::string& app_id,
-                       const IncomingMessage& message);
+                       const IncomingMessage& message,
+                       const GCMClient::MessageReceiptCallback& callback);

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

Did you compile this? MessageReceiptCallback is not a type of the GCMClient
class... (There's various occurrences of this.)

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

Please use |receipt_callback| instead of |callback| for MessageReceiptCallback
everywhere.

[harkness, 2017/02/09 16:27:29]

Done.

[harkness, 2017/02/09 16:27:29]

For my iterations, I've just been compiling components_unittests, I'd forgotten
about the changes in chrome/browser. I'll update those.

 
   const OutgoingMessage& last_sent_message() const {
     return last_sent_message_;