Re-enable WebView ChromeVox manual script injection when accessibility status changes.

chrome/browser/guest_view/web_view/chrome_web_view_guest_delegate.h

 // Copyright 2014 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_GUEST_VIEW_WEB_VIEW_CHROME_WEB_VIEW_GUEST_DELEGATE_H_
 #define CHROME_BROWSER_GUEST_VIEW_WEB_VIEW_CHROME_WEB_VIEW_GUEST_DELEGATE_H_
 
 #include "chrome/browser/extensions/api/web_view/chrome_web_view_internal_api.h"
 #include "extensions/browser/guest_view/web_view/web_view_guest.h"
 #include "extensions/browser/guest_view/web_view/web_view_guest_delegate.h"
@@ skipping 11 matching lines @@
 namespace extensions {
 
 class ChromeWebViewGuestDelegate : public WebViewGuestDelegate {
  public :
   explicit ChromeWebViewGuestDelegate(WebViewGuest* web_view_guest);
   ~ChromeWebViewGuestDelegate() override;
 
   // WebViewGuestDelegate implementation.
   bool HandleContextMenu(const content::ContextMenuParams& params) override;
   void OnAttachWebViewHelpers(content::WebContents* contents) override;
+  void OnDidInitialize() override;
   void OnGuestDestroyed() override;
   void OnShowContextMenu(int request_id, const MenuItemVector* items) override;
 
   WebViewGuest* web_view_guest() const { return web_view_guest_; }
 
  private:
   content::WebContents* guest_web_contents() const {
     return web_view_guest()->web_contents();
   }
 
   // Returns the top level items (ignoring submenus) as Value.
   static scoped_ptr<base::ListValue> MenuModelToValue(
       const ui::SimpleMenuModel& menu_model);
 
+  void InjectChromeVoxIfNeeded(content::RenderViewHost* render_view_host);
+
+#if defined(OS_CHROMEOS)
+  // Notification of a change in the state of an accessibility setting.
+  void OnAccessibilityStatusChanged(
+      const chromeos::AccessibilityStatusEventDetails& details);
+#endif
+
   // A counter to generate a unique request id for a context menu request.
   // We only need the ids to be unique for a given WebViewGuest.
   int pending_context_menu_request_id_;
 
+  // Set to |true| if ChromeVox was already injected in main frame.
+  bool chromevox_injected_;
+
   // Holds the RenderViewContextMenuBase that has been built but yet to be
   // shown. This is .reset() after ShowContextMenu().
   scoped_ptr<RenderViewContextMenuBase> pending_menu_;
 
+#if defined(OS_CHROMEOS)
+  // Subscription to receive notifications on changes to a11y settings.
+  scoped_ptr<chromeos::AccessibilityStatusSubscription>
+      accessibility_subscription_;
+#endif
+
   WebViewGuest* const web_view_guest_;
 
   // This is used to ensure pending tasks will not fire after this object is
   // destroyed.
   base::WeakPtrFactory<ChromeWebViewGuestDelegate> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeWebViewGuestDelegate);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_GUEST_VIEW_WEB_VIEW_CHROME_WEB_VIEW_GUEST_DELEGATE_H_
+