Add data usage tracking for GAIA auth api

google_apis/gaia/gaia_oauth_client.cc

Index: google_apis/gaia/gaia_oauth_client.cc
diff --git a/google_apis/gaia/gaia_oauth_client.cc b/google_apis/gaia/gaia_oauth_client.cc
index 6350e69695bc0d74349b1e5b5906c1294b44c0a6..8947febbc4dc270bed73f7d7ed2bf00e2be9bfd1 100644
--- a/google_apis/gaia/gaia_oauth_client.cc
+++ b/google_apis/gaia/gaia_oauth_client.cc
@@ -11,6 +11,7 @@
 #include "base/logging.h"
 #include "base/strings/string_util.h"
 #include "base/values.h"
+#include "google_apis/gaia/gaia_auth_util.h"
 #include "google_apis/gaia/gaia_urls.h"
 #include "net/base/escape.h"
 #include "net/base/load_flags.h"
@@ -183,6 +184,7 @@ void GaiaOAuthClient::Core::GetUserInfoImpl(
   request_->SetMaxRetriesOn5xx(max_retries);
   request_->SetLoadFlags(net::LOAD_DO_NOT_SEND_COOKIES |
                          net::LOAD_DO_NOT_SAVE_COOKIES);
+  MarkURLFetcherAsGaia(request_.get());
 
   // Fetchers are sometimes cancelled because a network change was detected,
   // especially at startup and after sign-in on ChromeOS. Retrying once should
@@ -222,6 +224,7 @@ void GaiaOAuthClient::Core::MakeGaiaRequest(
   request_->SetMaxRetriesOn5xx(max_retries);
   request_->SetLoadFlags(net::LOAD_DO_NOT_SEND_COOKIES |
                          net::LOAD_DO_NOT_SAVE_COOKIES);
+  MarkURLFetcherAsGaia(request_.get());
   // See comment on SetAutomaticallyRetryOnNetworkChanges() above.
   request_->SetAutomaticallyRetryOnNetworkChanges(3);
   request_->Start();