Lazy load chrome.* APIs

chrome/renderer/resources/extensions/tts_engine_custom_bindings.js

Index: chrome/renderer/resources/extensions/tts_engine_custom_bindings.js
diff --git a/chrome/renderer/resources/extensions/tts_engine_custom_bindings.js b/chrome/renderer/resources/extensions/tts_engine_custom_bindings.js
index f16f1438e1a7491a3be40a4b22ac7bd902b77c79..215168b80edad63d6ae58189606800b42d9288d0 100644
--- a/chrome/renderer/resources/extensions/tts_engine_custom_bindings.js
+++ b/chrome/renderer/resources/extensions/tts_engine_custom_bindings.js
@@ -2,10 +2,13 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Custom bindings for the ttsEngine API.
+// Custom binding for the ttsEngine API.
+
+var binding = require('binding').Binding.create('ttsEngine');
 
 var chromeHidden = requireNative('chrome_hidden').GetChromeHidden();
 
+chrome.Event;
 chromeHidden.Event.registerArgumentMassager('ttsEngine.onSpeak',
     function(args, dispatch) {
   var text = args[0];
@@ -16,3 +19,5 @@ chromeHidden.Event.registerArgumentMassager('ttsEngine.onSpeak',
   };
   dispatch([text, options, sendTtsEvent]);
 });
+
+exports.binding = binding.generate();