Enable posting a message from JS to Android webview.

android_webview/browser/jni_dependency_factory.h

 // Copyright (c) 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.
 
 #ifndef ANDROID_WEBVIEW_BROWSER_JNI_DEPENDENCY_FACTORY_H_
 #define ANDROID_WEBVIEW_BROWSER_JNI_DEPENDENCY_FACTORY_H_
 
 #include "base/memory/ref_counted.h"
 
 namespace content {
 class ExternalVideoSurfaceContainer;
 class WebContents;
 class WebContentsViewDelegate;
 }  // namespace content
 
 namespace android_webview {
 
 class AwBrowserContext;
+class AwMessagePortService;
 class AwQuotaManagerBridge;
 class AwWebPreferencesPopulater;
 
 // Used to create instances of objects under native that are used in browser.
 class JniDependencyFactory {
  public:
   virtual ~JniDependencyFactory() {}
 
   virtual scoped_refptr<AwQuotaManagerBridge> CreateAwQuotaManagerBridge(
       AwBrowserContext* browser_context) = 0;
   virtual content::WebContentsViewDelegate* CreateViewDelegate(
       content::WebContents* web_contents) = 0;
   virtual AwWebPreferencesPopulater* CreateWebPreferencesPopulater() = 0;
+  virtual AwMessagePortService* CreateAwMessagePortService() = 0;
 #if defined(VIDEO_HOLE)
   virtual content::ExternalVideoSurfaceContainer*
       CreateExternalVideoSurfaceContainer(content::WebContents* contents) = 0;
 #endif
 };
 
 }  // namespace android_webview
 
 #endif  // ANDROID_WEBVIEW_BROWSER_JNI_DEPENDENCY_FACTORY_H_