Add checkin activity recording to gcm recorder.

google_apis/gcm/engine/checkin_request.h

Index: google_apis/gcm/engine/checkin_request.h
diff --git a/google_apis/gcm/engine/checkin_request.h b/google_apis/gcm/engine/checkin_request.h
index abe4e6edeaa99b7143ddfc68d0e6fd64dc63b35b..0f04505af0d92501f1b579433b7fd65a703c9b7a 100644
--- a/google_apis/gcm/engine/checkin_request.h
+++ b/google_apis/gcm/engine/checkin_request.h
@@ -24,6 +24,8 @@ class URLRequestContextGetter;
 
 namespace gcm {
 
+class GCMStatsRecorder;
+
 // Enables making check-in requests with the GCM infrastructure. When called
 // with android_id and security_token both set to 0 it is an initial check-in
 // used to obtain credentials. These should be persisted and used for subsequent
@@ -60,7 +62,8 @@ class GCM_EXPORT CheckinRequest : public net::URLFetcherDelegate {
                  const RequestInfo& request_info,
                  const net::BackoffEntry::Policy& backoff_policy,
                  const CheckinRequestCallback& callback,
-                 net::URLRequestContextGetter* request_context_getter);
+                 net::URLRequestContextGetter* request_context_getter,
+                 GCMStatsRecorder* recorder);
   virtual ~CheckinRequest();
 
   void Start();
@@ -81,6 +84,9 @@ class GCM_EXPORT CheckinRequest : public net::URLFetcherDelegate {
   scoped_ptr<net::URLFetcher> url_fetcher_;
   const RequestInfo request_info_;
 
+  // Recorder that records GCM activities for debugging purpose. Not owned.
+  GCMStatsRecorder* recorder_;
+
   base::WeakPtrFactory<CheckinRequest> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(CheckinRequest);