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

chrome/browser/chromeos/accessibility/accessibility_manager.cc

 // Copyright (c) 2013 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/chromeos/accessibility/accessibility_manager.h"
 
 #include "ash/audio/sounds.h"
 #include "ash/autoclick/autoclick_controller.h"
 #include "ash/high_contrast/high_contrast_controller.h"
 #include "ash/metrics/user_metrics_recorder.h"
@@ skipping 92 matching lines @@
 // Uses the ScriptExecutor associated with the given |render_view_host| to
 // execute the given |code|.
 void ExecuteScriptHelper(
     content::RenderViewHost* render_view_host,
     const std::string& code,
     const std::string& extension_id) {
   content::WebContents* web_contents =
       content::WebContents::FromRenderViewHost(render_view_host);
   if (!web_contents)
     return;
+  if (!extensions::TabHelper::FromWebContents(web_contents))
+    extensions::TabHelper::CreateForWebContents(web_contents);
   extensions::TabHelper::FromWebContents(web_contents)->script_executor()->
       ExecuteScript(HostID(HostID::EXTENSIONS, extension_id),
                     extensions::ScriptExecutor::JAVASCRIPT,
                     code,
                     extensions::ScriptExecutor::ALL_FRAMES,
                     extensions::ScriptExecutor::DONT_MATCH_ABOUT_BLANK,
                     extensions::UserScript::DOCUMENT_IDLE,
                     extensions::ScriptExecutor::ISOLATED_WORLD,
                     extensions::ScriptExecutor::DEFAULT_PROCESS,
                     GURL(),  // No webview src.
@@ skipping 997 matching lines @@
 void AccessibilityManager::PostUnloadChromeVox(Profile* profile) {
   // Do any teardown work needed immediately after ChromeVox actually unloads.
   if (system_sounds_enabled_)
     ash::PlaySystemSoundAlways(SOUND_SPOKEN_FEEDBACK_DISABLED);
   // Clear the accessibility focus ring.
   AccessibilityFocusRingController::GetInstance()->SetFocusRing(
       std::vector<gfx::Rect>());
 }
 
 }  // namespace chromeos