[Android WebView] Implement initial settings and callback support for Service Workers.

android_webview/browser/aw_contents_io_thread_client.h

 // 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.
 
 #ifndef ANDROID_WEBVIEW_BROWSER_AW_CONTENTS_IO_THREAD_CLIENT_H_
 #define ANDROID_WEBVIEW_BROWSER_AW_CONTENTS_IO_THREAD_CLIENT_H_
 
 #include <stdint.h>
 
 #include <string>
@@ skipping 48 matching lines @@
   // This method is called on the IO thread only.
   virtual CacheMode GetCacheMode() const = 0;
 
   // This will attempt to fetch the AwContentsIoThreadClient for the given
   // |render_process_id|, |render_frame_id| pair.
   // This method can be called from any thread.
   // An empty scoped_ptr is a valid return value.
   static scoped_ptr<AwContentsIoThreadClient> FromID(int render_process_id,
                                                      int render_frame_id);
 
+  // Returns the global thread client for service worker related callbacks.
+  // An empty scoped_ptr is a valid return value.
+  static scoped_ptr<AwContentsIoThreadClient> GetServiceWorkerIoThreadClient();
+
   // Called on the IO thread when a subframe is created.
   static void SubFrameCreated(int render_process_id,
                               int parent_render_frame_id,
                               int child_render_frame_id);
 
   // This method is called on the IO thread only.
   typedef base::Callback<void(scoped_ptr<AwWebResourceResponse>)>
       ShouldInterceptRequestResultCallback;
   virtual void ShouldInterceptRequestAsync(
       const net::URLRequest* request,
@@ skipping 36 matching lines @@
 
   // Called when a response from the server is received with status code >= 400.
   virtual void OnReceivedHttpError(
       const net::URLRequest* request,
       const net::HttpResponseHeaders* response_headers) = 0;
 };
 
 } // namespace android_webview
 
 #endif  // ANDROID_WEBVIEW_BROWSER_AW_CONTENTS_IO_THREAD_CLIENT_H_