Add skeleton for select-to-speak component extension.

chrome/common/extensions/extension_constants.cc

 // Copyright (c) 2012 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 "base/macros.h"
 #include "build/build_config.h"
 #include "chrome/common/extensions/extension_constants.h"
 
 namespace extension_urls {
 
@@ skipping 41 matching lines @@
 const char kHotwordNewExtensionId[] = "nbpagnldghgfoolbancepceaanlmhfmd";
 const char kHotwordSharedModuleId[] = "lccekmodgklaepjeofjdjpbminllajkg";
 const char kYoutubeAppId[] = "blpcfgokakmgnkcojhhkbfbldkacnbeo";
 const char kInAppPaymentsSupportAppId[] = "nmmhkkegccagdldgiimedpiccmgmieda";
 #if defined(ENABLE_MEDIA_ROUTER)
 const char kMediaRouterStableExtensionId[] = "pkedcjkdefgpdelpbcmbmeomcjbeemfm";
 #endif  // defined(ENABLE_MEDIA_ROUTER)
 
 #if defined(OS_CHROMEOS)
 // The extension id for the built-in component extension.
-const char kChromeVoxExtensionId[] =
-    "mndnfokpggljbaajbnioimlmbfngpief";
+const char kChromeVoxExtensionId[] = "mndnfokpggljbaajbnioimlmbfngpief";
 const char kChromeVoxExtensionPath[] = "chromeos/chromevox";
+const char kSelectToSpeakExtensionId[] = "klbcgckkldhdhonijdbnhhaiedfkllef";
+const char kSelectToSpeakExtensionPath[] = "chromeos/select_to_speak";
 const char kGuestManifestFilename[] = "manifest_guest.json";
 const char kBrailleImeExtensionId[] =
     "jddehjeebkoimngcbdkaahpobgicbffp";
 const char kBrailleImeExtensionPath[] =
     "chromeos/braille_ime";
 const char kBrailleImeEngineId[] =
     "_comp_ime_jddehjeebkoimngcbdkaahpobgicbffpbraille";
 const char kConnectivityDiagnosticsPath[] =
     "/usr/share/chromeos-assets/connectivity_diagnostics";
 const char kConnectivityDiagnosticsLauncherPath[] =
@@ skipping 56 matching lines @@
   const char* const kImeMenuExtensionIds[] = {
       "gjaehgfemfahhmlgpdfknkhdnemmolop", "jkghodnilhceideoidjikpgommlajknk"};
   for (const char* id : kImeMenuExtensionIds) {
     if (extension_id == id)
       return true;
   }
   return false;
 }
 #endif
 }  // namespace extension_misc