Add data usage tracking for GAIA auth api

google_apis/gaia/gaia_auth_util.cc

Index: google_apis/gaia/gaia_auth_util.cc
diff --git a/google_apis/gaia/gaia_auth_util.cc b/google_apis/gaia/gaia_auth_util.cc
index 93b449690dda9797105d5c6bce7f7662094d0cc6..2bbee2a8060b3dbea42872a24ad0ce85e6a9c20b 100644
--- a/google_apis/gaia/gaia_auth_util.cc
+++ b/google_apis/gaia/gaia_auth_util.cc
@@ -8,12 +8,15 @@
 
 #include <memory>
 
+#include "base/bind.h"
 #include "base/json/json_reader.h"
 #include "base/logging.h"
 #include "base/strings/string_split.h"
 #include "base/strings/string_util.h"
 #include "base/values.h"
 #include "google_apis/gaia/gaia_urls.h"
+#include "net/url_request/url_fetcher.h"
+#include "net/url_request/url_request.h"
 #include "url/gurl.h"
 
 namespace gaia {
@@ -23,6 +26,9 @@ namespace {
 const char kGmailDomain[] = "gmail.com";
 const char kGooglemailDomain[] = "googlemail.com";
 
+const void* kURLRequestUserDataKey =
+    static_cast<const void*>(&kURLRequestUserDataKey);
+
 std::string CanonicalizeEmailImpl(const std::string& email_address,
                                   bool change_googlemail_to_gmail) {
   std::vector<std::string> parts = base::SplitString(
@@ -44,6 +50,13 @@ std::string CanonicalizeEmailImpl(const std::string& email_address,
   return new_email;
 }
 
+class GaiaURLRequestUserData : public base::SupportsUserData::Data {
+ public:
+  static base::SupportsUserData::Data* Create() {
+    return new GaiaURLRequestUserData();
+  }
+};
+
 }  // namespace
 
 
@@ -180,4 +193,14 @@ bool ParseListAccountsData(const std::string& data,
   return true;
 }
 
+bool RequestOriginatedFromGaia(const net::URLRequest& request) {
+  return request.GetUserData(kURLRequestUserDataKey) != nullptr;
+}
+
+void MarkURLFetcherAsGaia(net::URLFetcher* fetcher) {
+  DCHECK(fetcher);
+  fetcher->SetURLRequestUserData(kURLRequestUserDataKey,
+                                 base::Bind(&GaiaURLRequestUserData::Create));
+}
+
 }  // namespace gaia