Add WaitForInterstitialReady to browser_test_utils.

content/public/test/browser_test_utils.cc

 // Copyright (c) 2012 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 "content/public/test/browser_test_utils.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/json/json_reader.h"
 #include "base/process/kill.h"
@@ skipping 705 matching lines @@
       new content::MessageLoopRunner);
   InterstitialObserver observer(web_contents,
                                 base::Closure(),
                                 loop_runner->QuitClosure());
   if (!task.is_null())
     task.Run();
   // At this point, web_contents may have been deleted.
   loop_runner->Run();
 }
 
+bool WaitForRenderFrameReady(RenderFrameHost* rfh) {
+  if (!rfh)
+    return false;
+  std::string result;
+  EXPECT_TRUE(
+      content::ExecuteScriptAndExtractString(
+          rfh,
+          "(function() {"
+          "  var done = false;"
+          "  function checkState() {"
+          "    if (!done && document.readyState == 'complete') {"
+          "      done = true;"
+          "      window.domAutomationController.send('pageLoadComplete');"
+          "    }"
+          "  }"
+          "  checkState();"
+          "  document.addEventListener('readystatechange', checkState);"
+          "})();",
+          &result));
+  return result == "pageLoadComplete";
+}
+
 TitleWatcher::TitleWatcher(WebContents* web_contents,
                            const base::string16& expected_title)
     : WebContentsObserver(web_contents),
       message_loop_runner_(new MessageLoopRunner) {
   EXPECT_TRUE(web_contents != NULL);
   expected_titles_.push_back(expected_title);
 }
 
 void TitleWatcher::AlsoWaitForTitle(const base::string16& expected_title) {
   expected_titles_.push_back(expected_title);
@@ skipping 181 matching lines @@
 
 bool WebContentsAddedObserver::RenderViewCreatedCalled() {
   if (child_observer_) {
     return child_observer_->render_view_created_called_ &&
            child_observer_->main_frame_created_called_;
   }
   return false;
 }
 
 }  // namespace content