[cros] Change how login-prompt-visible signal is emitted when accelerated compositing is enabled.

chrome/browser/chromeos/login/webui_login_view.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_BROWSER_CHROMEOS_LOGIN_WEBUI_LOGIN_VIEW_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_WEBUI_LOGIN_VIEW_H_
 #pragma once
 
 #include <map>
 #include <string>
@@ skipping 93 matching lines @@
 
   // Overridden from content::WebContentsDelegate.
   virtual bool HandleContextMenu(
       const content::ContextMenuParams& params) OVERRIDE;
   virtual void HandleKeyboardEvent(
       const content::NativeWebKeyboardEvent& event) OVERRIDE;
   virtual bool IsPopupOrPanel(
       const content::WebContents* source) const OVERRIDE;
   virtual bool TakeFocus(bool reverse) OVERRIDE;
 
+  // Returs true is accelerated compositing is enabled for sign in.
+  bool IsAcceleratedCompositingEnabled();
+
+  // Performs series of action when login prompt is considered
+  // to be ready and visible.
+  // 1. Resets TabRenderWatcher instance.
+  // 2. Emits LoginPromptVisible signal if needed
+  // 3. Notifies OOBE/sign classes.
+  void OnLoginPromptVisible();
+
   // Called when focus is returned from status area.
   // |reverse| is true when focus is traversed backwards (using Shift-Tab).
   void ReturnFocus(bool reverse);
 
   content::NotificationRegistrar registrar_;
 
   // TabContentsWrapper for the WebView.
   // TODO: this is needed for password manager, should be refactored/replaced
   //       so that this code can move to src/ash.
   scoped_ptr<TabContentsWrapper> wrapper_;
@@ skipping 11 matching lines @@
   scoped_ptr<TabRenderWatcher> tab_watcher_;
 
   // Whether the host window is frozen.
   bool host_window_frozen_;
 
   // Has the login page told us that it's ready?  This is triggered by either
   // all of the user images or the GAIA prompt being loaded, whichever comes
   // first.
   bool login_page_is_loaded_;
 
+  // True if OnLoginPromptVisible() has been called.
+  bool login_prompt_visible_notified_;
+
   // Should we emit the login-prompt-visible signal when the login page is
   // displayed?
   bool should_emit_login_prompt_visible_;
 
   DISALLOW_COPY_AND_ASSIGN(WebUILoginView);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_WEBUI_LOGIN_VIEW_H_