[GCM] Add more UMA to GCM

google_apis/gcm/engine/unregistration_request.cc

Index: google_apis/gcm/engine/unregistration_request.cc
diff --git a/google_apis/gcm/engine/unregistration_request.cc b/google_apis/gcm/engine/unregistration_request.cc
index 92136bff3f1ed7547521d20930e4fc110b0a99a2..2b8c97dadf1066f56a64d31fd657bbda929059c1 100644
--- a/google_apis/gcm/engine/unregistration_request.cc
+++ b/google_apis/gcm/engine/unregistration_request.cc
@@ -159,6 +159,7 @@ void UnregistrationRequest::Start() {
 
   DVLOG(1) << "Performing unregistration for: " << request_info_.app_id;
   recorder_->RecordUnregistrationSent(request_info_.app_id);
+  request_start_time_ = base::TimeTicks::Now();
   url_fetcher_->Start();
 }
 
@@ -204,11 +205,20 @@ void UnregistrationRequest::OnURLFetchComplete(const net::URLFetcher* source) {
       status == INCORRECT_APP_ID ||
       status == RESPONSE_PARSING_FAILED) {
     RetryWithBackoff(true);
-  } else {
-    // status == SUCCESS || HTTP_NOT_OK || NO_RESPONSE_BODY ||
-    // INVALID_PARAMETERS || UNKNOWN_ERROR
-    callback_.Run(status);
+    return;
   }
+
+  // status == SUCCESS || HTTP_NOT_OK || NO_RESPONSE_BODY ||
+  // INVALID_PARAMETERS || UNKNOWN_ERROR
+
+  if (status == SUCCESS) {
+    UMA_HISTOGRAM_COUNTS("GCM.UnregistrationRetryCount",
+                         backoff_entry_.failure_count());
+    UMA_HISTOGRAM_TIMES("GCM.UnregistrationCompleteTime",
+                        base::TimeTicks::Now() - request_start_time_);
+  }
+
+  callback_.Run(status);
 }
 
 }  // namespace gcm