Add UI test for click-to-play.

chrome/test/automation/tab_proxy.h

 // Copyright (c) 2010 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_AUTOMATION_TAB_PROXY_H_
 #define CHROME_TEST_AUTOMATION_TAB_PROXY_H_
 #pragma once
 
 #include "build/build_config.h"  // NOLINT
 
@@ skipping 357 matching lines @@
   // tab_proxy->SomeOperationThatTriggersAnAsynchronousNavigation();
   // tab_proxy->WaitForNavigation(last_nav_time);
   bool WaitForNavigation(int64 last_navigation_time) WARN_UNUSED_RESULT;
 
   // Gets the current used encoding of the page in the tab.
   bool GetPageCurrentEncoding(std::string* encoding) WARN_UNUSED_RESULT;
 
   // Uses the specified encoding to override encoding of the page in the tab.
   bool OverrideEncoding(const std::string& encoding) WARN_UNUSED_RESULT;
 
+  // Loads all blocked plug-ins on the page.
+  bool LoadBlockedPlugins() WARN_UNUSED_RESULT;
+
 #if defined(OS_WIN)
   // Resizes the tab window.
   // The parent_window parameter allows a parent to be specified for the window
   // passed in.
   void Reposition(HWND window, HWND window_insert_after, int left, int top,
                   int width, int height, int flags, HWND parent_window);
 
   // Sends the selected context menu command to the chrome instance
   void SendContextMenuCommand(int selected_command);
 
@@ skipping 36 matching lines @@
   // purposes.
   void LastObjectRemoved();
 
  private:
   Lock list_lock_;  // Protects the observers_list_.
   ObserverList<TabProxyDelegate> observers_list_;
   DISALLOW_COPY_AND_ASSIGN(TabProxy);
 };
 
 #endif  // CHROME_TEST_AUTOMATION_TAB_PROXY_H_