Add GCM check in status code metric collection. We also decided to collect registration success sig…

google_apis/gcm/engine/registration_request.cc

Index: google_apis/gcm/engine/registration_request.cc
diff --git a/google_apis/gcm/engine/registration_request.cc b/google_apis/gcm/engine/registration_request.cc
index 5635e5e62fdf9108facfc3636c4b8ad576ca2eb3..2880855110bf08053f7f7c7eb2cb3cdeb9fbc037 100644
--- a/google_apis/gcm/engine/registration_request.cc
+++ b/google_apis/gcm/engine/registration_request.cc
@@ -203,6 +203,8 @@ void RegistrationRequest::OnURLFetchComplete(const net::URLFetcher* source) {
   if (token_pos != std::string::npos) {
     std::string token =
         response.substr(token_pos + arraysize(kTokenPrefix) - 1);
+    UMA_HISTOGRAM_ENUMERATION("GCM.RegistrationRequestStatus", SUCCESS,
+                              RegistrationRequest::STATUS_COUNT);
     callback_.Run(SUCCESS, token);
     return;
   }