Add skeleton for select-to-speak component extension.

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 <stddef.h>
 #include <stdint.h>
 
 #include <memory>
@@ skipping 286 matching lines @@
                       bundle.GetRawDataResource(IDR_SOUND_ENTER_SCREEN_WAV));
 
   base::FilePath resources_path;
   if (!PathService::Get(chrome::DIR_RESOURCES, &resources_path))
     NOTREACHED();
   chromevox_loader_ = base::WrapUnique(new AccessibilityExtensionLoader(
       extension_misc::kChromeVoxExtensionId,
       resources_path.Append(extension_misc::kChromeVoxExtensionPath),
       base::Bind(&AccessibilityManager::PostUnloadChromeVox,
                  weak_ptr_factory_.GetWeakPtr())));
+  select_to_speak_loader_ = base::WrapUnique(new AccessibilityExtensionLoader(
+      extension_misc::kSelectToSpeakExtensionId,
+      resources_path.Append(extension_misc::kSelectToSpeakExtensionPath),
+      base::Closure()));
 }
 
 AccessibilityManager::~AccessibilityManager() {
   CHECK(this == g_accessibility_manager);
   AccessibilityStatusEventDetails details(ACCESSIBILITY_MANAGER_SHUTDOWN, false,
                                           ash::A11Y_NOTIFICATION_NONE);
   NotifyAccessibilityStatusChanged(details);
   input_method::InputMethodManager::Get()->RemoveObserver(this);
 
   if (chromevox_panel_) {
@@ skipping 515 matching lines @@
   if (!profile_)
     return;
 
   const bool enabled = profile_->GetPrefs()->GetBoolean(
       prefs::kAccessibilitySelectToSpeakEnabled);
 
   if (select_to_speak_enabled_ == enabled)
     return;
   select_to_speak_enabled_ = enabled;
 
-  // TODO(dmazzoni): implement feature here.
+  if (enabled) {
+    select_to_speak_loader_->Load(profile_, "" /* init_script_str */,
+                                  base::Closure() /* done_cb */);
+  } else {
+    select_to_speak_loader_->Unload();
+  }
 }
 
 void AccessibilityManager::SetSwitchAccessEnabled(bool enabled) {
   if (!profile_)
     return;
 
   PrefService* pref_service = profile_->GetPrefs();
   pref_service->SetBoolean(prefs::kAccessibilitySwitchAccessEnabled, enabled);
   pref_service->CommitPendingWrite();
 }
@@ skipping 480 matching lines @@
     content::BrowserContext* context) {
   keyboard_listener_extension_id_ = id;
 
   extensions::ExtensionRegistry* registry =
       extensions::ExtensionRegistry::Get(context);
   if (!extension_registry_observer_.IsObserving(registry) && !id.empty())
     extension_registry_observer_.Add(registry);
 }
 
 }  // namespace chromeos