Begin to enable extension APIs in Extension Service Worker.

chrome/common/extensions/chrome_extensions_client.cc

 // Copyright 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/common/extensions/chrome_extensions_client.h"
 
 #include <memory>
 
 #include "base/command_line.h"
 #include "base/files/file_path.h"
@@ skipping 360 matching lines @@
     page_action->default_icon.GetPaths(&image_paths);
 
   const extensions::ActionInfo* browser_action =
       extensions::ActionInfo::GetBrowserActionInfo(extension);
   if (browser_action && !browser_action->default_icon.empty())
     browser_action->default_icon.GetPaths(&image_paths);
 
   return image_paths;
 }
 
+bool ChromeExtensionsClient::ExtensionAPIEnabledInExtensionServiceWorkers()
+    const {
+  return GetCurrentChannel() <= version_info::Channel::UNKNOWN;

[falken, 2016/04/20 02:31:45]

Should this just be == UNKNOWN?

[lazyboy, 2016/04/21 05:52:15]

Done.

+}
+
 // static
 ChromeExtensionsClient* ChromeExtensionsClient::GetInstance() {
   return g_client.Pointer();
 }
 
 }  // namespace extensions