Plugin Power Saver: Implement pixel tests for plugin placeholders.

chrome/test/base/ui_test_utils.h

 // 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.
 
 #ifndef CHROME_TEST_BASE_UI_TEST_UTILS_H_
 #define CHROME_TEST_BASE_UI_TEST_UTILS_H_
 
 #include <map>
 #include <queue>
 #include <set>
@@ skipping 144 matching lines @@
 // Gets the first browser that is not in the specified set.
 Browser* GetBrowserNotInSet(const std::set<Browser*>& excluded_browsers);
 
 // Gets the size and value of the cookie string for |url| in the given tab.
 // Can be called from any thread.
 void GetCookies(const GURL& url,
                 content::WebContents* contents,
                 int* value_size,
                 std::string* value);
 
+// Runs the current MessageLoop until |condition| is true or timeout.
+bool RunLoopUntil(const base::Callback<bool()>& condition);
+
 // A WindowedNotificationObserver hard-wired to observe
 // chrome::NOTIFICATION_TAB_ADDED.
 class WindowedTabAddedNotificationObserver
     : public content::WindowedNotificationObserver {
  public:
   // Register to listen for notifications of NOTIFICATION_TAB_ADDED from either
   // a specific source, or from all sources if |source| is
   // NotificationService::AllSources().
   explicit WindowedTabAddedNotificationObserver(
       const content::NotificationSource& source);
@@ skipping 108 matching lines @@
   std::vector<GURL> urls_;
 
   base::CancelableTaskTracker tracker_;
 
   DISALLOW_COPY_AND_ASSIGN(HistoryEnumerator);
 };
 
 }  // namespace ui_test_utils
 
 #endif  // CHROME_TEST_BASE_UI_TEST_UTILS_H_