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

chrome/browser/guest_view/web_view/chrome_web_view_guest_delegate.cc

 // 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.
 
 
 #include "chrome/browser/guest_view/web_view/chrome_web_view_guest_delegate.h"
 
 #include "chrome/browser/extensions/chrome_extension_web_contents_observer.h"
 #include "chrome/browser/favicon/favicon_helper.h"
 #include "chrome/browser/profiles/profile.h"
@@ skipping 17 matching lines @@
 #endif  // defined(ENABLE_PRINT_PREVIEW)
 #endif  // defined(ENABLE_PRINTING)
 
 using guest_view::GuestViewEvent;
 
 namespace extensions {
 
 ChromeWebViewGuestDelegate::ChromeWebViewGuestDelegate(
     WebViewGuest* web_view_guest)
     : pending_context_menu_request_id_(0),
+      chromevox_injected_(false),
       web_view_guest_(web_view_guest),
       weak_ptr_factory_(this) {
 }
 
 ChromeWebViewGuestDelegate::~ChromeWebViewGuestDelegate() {
 }
 
 bool ChromeWebViewGuestDelegate::HandleContextMenu(
     const content::ContextMenuParams& params) {
   ContextMenuDelegate* menu_delegate =
@@ skipping 32 matching lines @@
 #else
   printing::PrintViewManagerBasic::CreateForWebContents(contents);
 #endif  // defined(ENABLE_PRINT_PREVIEW)
 #endif  // defined(ENABLE_PRINTING)
   pdf::PDFWebContentsHelper::CreateForWebContentsWithClient(
       contents,
       scoped_ptr<pdf::PDFWebContentsHelperClient>(
           new ChromePDFWebContentsHelperClient()));
 }
 
+void ChromeWebViewGuestDelegate::OnDidInitialize() {
+#if defined(OS_CHROMEOS)
+  chromeos::AccessibilityManager* accessibility_manager =
+      chromeos::AccessibilityManager::Get();
+  CHECK(accessibility_manager);
+  accessibility_subscription_ = accessibility_manager->RegisterCallback(
+      base::Bind(&ChromeWebViewGuestDelegate::OnAccessibilityStatusChanged,
+                 weak_ptr_factory_.GetWeakPtr()));
+#endif
+}
+
 void ChromeWebViewGuestDelegate::OnGuestDestroyed() {
   // Clean up custom context menu items for this guest.
   MenuManager* menu_manager = MenuManager::Get(
       Profile::FromBrowserContext(web_view_guest()->browser_context()));
   menu_manager->RemoveAllContextItems(MenuItem::ExtensionKey(
       web_view_guest()->owner_host(),
       web_view_guest()->view_instance_id()));
 }
 
 // static
@@ skipping 23 matching lines @@
     return;
 
   // TODO(lazyboy): Implement.
   DCHECK(!items);
 
   ContextMenuDelegate* menu_delegate =
       ContextMenuDelegate::FromWebContents(guest_web_contents());
   menu_delegate->ShowMenu(pending_menu_.Pass());
 }
 
+void ChromeWebViewGuestDelegate::InjectChromeVoxIfNeeded(
+    content::RenderViewHost* render_view_host) {
+#if defined(OS_CHROMEOS)
+  if (!chromevox_injected_) {
+    chromeos::AccessibilityManager* manager =
+        chromeos::AccessibilityManager::Get();
+    if (manager && manager->IsSpokenFeedbackEnabled()) {
+      manager->InjectChromeVox(render_view_host);
+      chromevox_injected_ = true;
+    }
+  }
+#endif
+}
+
+#if defined(OS_CHROMEOS)
+void ChromeWebViewGuestDelegate::OnAccessibilityStatusChanged(
+    const chromeos::AccessibilityStatusEventDetails& details) {
+  if (details.notification_type == chromeos::ACCESSIBILITY_MANAGER_SHUTDOWN) {
+    accessibility_subscription_.reset();
+  } else if (details.notification_type ==
+      chromeos::ACCESSIBILITY_TOGGLE_SPOKEN_FEEDBACK) {
+    if (details.enabled)
+      InjectChromeVoxIfNeeded(guest_web_contents()->GetRenderViewHost());
+    else
+      chromevox_injected_ = false;
+  }
+}
+#endif
+
 }  // namespace extensions