pass script fetch start / end time to Transalte Element to implement real time latency monitoring

chrome/renderer/translate/translate_script_browsertest.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/macros.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/test/base/chrome_render_view_test.h"
 #include "components/translate/core/common/translate_errors.h"
 #include "grit/components_resources.h"
@@ skipping 21 matching lines @@
 
 // JavaScript code to check if the library is ready.
 const char kLibReady[] = "cr.googleTranslate.libReady";
 
 // JavaScript code to perform translation.
 const char kTranslate[] = "cr.googleTranslate.translate('auto', 'en')";
 
 // JavaScript code to mimic element.js provided by a translate server.
 const char kElementJs[] =
     "serverParams = '';"
+    "gtTimeInfo = {};"
     "translateApiKey = '';"
     "google = {};"
     "google.translate = {};"
     "google.translate.TranslateService = function() {"
     "  if (window['throwInitializationError']) {"
     "    throw 'API initialization error';"
     "  }"
     "  return {"
     "    isAvailable: function() { return true; },"
     "    restore: function() {},"
@@ skipping 177 matching lines @@
   EXPECT_FALSE(GetError());
   EXPECT_EQ(translate::TranslateErrors::NONE, GetErrorCode());
 
   ExecuteScript(kTranslate);
 
   EXPECT_TRUE(GetError());
   EXPECT_EQ(translate::TranslateErrors::UNSUPPORTED_LANGUAGE, GetErrorCode());
 }
 
 // TODO(toyoshim): Add test for onLoadJavaScript.