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

components/gcm_driver/gcm_account_mapper.h

Index: components/gcm_driver/gcm_account_mapper.h
diff --git a/components/gcm_driver/gcm_account_mapper.h b/components/gcm_driver/gcm_account_mapper.h
index 39cd4dd792e3969450a73cb3d06097be6413f16f..d844f24d15df074a35cf051dba3f0cc190d760e3 100644
--- a/components/gcm_driver/gcm_account_mapper.h
+++ b/components/gcm_driver/gcm_account_mapper.h
@@ -14,6 +14,7 @@
 #include "base/memory/weak_ptr.h"
 #include "components/gcm_driver/gcm_app_handler.h"
 #include "components/gcm_driver/gcm_client.h"
+#include "components/gcm_driver/gcm_message_status.h"
 #include "google_apis/gcm/engine/account_mapping.h"
 
 namespace base {
@@ -31,7 +32,8 @@ class GCMAccountMapper : public GCMAppHandler {
   // List of account mappings.
   typedef std::vector<AccountMapping> AccountMappings;
   typedef base::Callback<void(const std::string& app_id,
-                              const IncomingMessage& message)>
+                              const IncomingMessage& message,
+                              const MessageReceiptCallback& callback)>
       DispatchMessageCallback;

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

nit: I know you're just passing by, but mind updating these typedefs to the
newer `using` syntax?

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

Done.

 
   explicit GCMAccountMapper(GCMDriver* gcm_driver);