Add data usage tracking for GAIA auth api

google_apis/gaia/gaia_auth_util.h

Index: google_apis/gaia/gaia_auth_util.h
diff --git a/google_apis/gaia/gaia_auth_util.h b/google_apis/gaia/gaia_auth_util.h
index d9fbf04a7083dd2634fd58fb053d26ce7c4797fe..f71ad99ebd9480e2a94724139a8c6376d212fe2d 100644
--- a/google_apis/gaia/gaia_auth_util.h
+++ b/google_apis/gaia/gaia_auth_util.h
@@ -11,6 +11,11 @@
 
 class GURL;
 
+namespace net {
+class URLRequest;
+class URLFetcher;
+};
+
 namespace gaia {
 
 struct ListedAccount {
@@ -59,6 +64,12 @@ bool ParseListAccountsData(const std::string& data,
                            std::vector<ListedAccount>* accounts,
                            std::vector<ListedAccount>* signed_out_accounts);
 
+// Returns true if the URL request originated from GAIA.
+bool RequestOriginatedFromGaia(const net::URLRequest& request);
+
+// Marks the URL request as a Gaia request.
+void MarkURLFetcherAsGaia(net::URLFetcher* request);
+
 }  // namespace gaia
 
 #endif  // GOOGLE_APIS_GAIA_GAIA_AUTH_UTIL_H_