Add skeleton for select-to-speak component extension.

chrome/browser/chromeos/accessibility/accessibility_manager.cc

Index: chrome/browser/chromeos/accessibility/accessibility_manager.cc
diff --git a/chrome/browser/chromeos/accessibility/accessibility_manager.cc b/chrome/browser/chromeos/accessibility/accessibility_manager.cc
index f18de79161647198cefec585d11aa351e5d73e28..e7f6dc5c69094fc71722772f4b8f2cee21938130 100644
--- a/chrome/browser/chromeos/accessibility/accessibility_manager.cc
+++ b/chrome/browser/chromeos/accessibility/accessibility_manager.cc
@@ -304,6 +304,10 @@ AccessibilityManager::AccessibilityManager()
       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() {
@@ -839,7 +843,11 @@ void AccessibilityManager::UpdateSelectToSpeakFromPref() {
     return;
   select_to_speak_enabled_ = enabled;
 
-  // TODO(dmazzoni): implement feature here.
+  if (enabled) {
+    select_to_speak_loader_->Load(profile_, "", base::Closure());

[David Tseng, 2016/09/16 21:16:02]

"" /* param_name */

[dmazzoni, 2016/09/16 22:06:20]

Done

+  } else {
+    select_to_speak_loader_->Unload();
+  }
 }
 
 void AccessibilityManager::SetSwitchAccessEnabled(bool enabled) {