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 5ae8dd33a0425099e06fc6a5460ee9b8a7bf60ee..1b81b80ca0ace8d033b4a58570cec34e24c61fe8 100644
--- a/google_apis/gcm/engine/checkin_request.h
+++ b/google_apis/gcm/engine/checkin_request.h
@@ -23,6 +23,8 @@ 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
@@ -58,7 +60,8 @@ class GCM_EXPORT CheckinRequest : public net::URLFetcherDelegate {
   CheckinRequest(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();
@@ -78,6 +81,9 @@ 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);