Add skeleton for select-to-speak component extension.

chrome/common/extensions/extension_constants.cc

Index: chrome/common/extensions/extension_constants.cc
diff --git a/chrome/common/extensions/extension_constants.cc b/chrome/common/extensions/extension_constants.cc
index 4aa72be9e8d865a6d78a66d225b682237ad322f8..0aba0f6aac63ab82809132f6d0342dff3c7eb71d 100644
--- a/chrome/common/extensions/extension_constants.cc
+++ b/chrome/common/extensions/extension_constants.cc
@@ -59,9 +59,10 @@ const char kMediaRouterStableExtensionId[] = "pkedcjkdefgpdelpbcmbmeomcjbeemfm";
 
 #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";