[Android WebView] Call shouldInterceptRequest on a background thread

android_webview/browser/aw_web_resource_response.cc

 // Copyright 2014 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 "android_webview/browser/aw_web_resource_response.h"
 
 #include "android_webview/browser/input_stream.h"
 #include "android_webview/browser/net/android_stream_reader_url_request_job.h"
 #include "base/strings/string_number_conversions.h"
 #include "net/http/http_response_headers.h"
@@ skipping 50 matching lines @@
     aw_web_resource_response_->GetResponseHeaders(env, headers);
   }
 
  private:
   scoped_ptr<AwWebResourceResponse> aw_web_resource_response_;
 };
 
 }  // namespace
 
 // static
-net::URLRequestJob* AwWebResourceResponse::CreateJobFor(
-    scoped_ptr<AwWebResourceResponse> aw_web_resource_response,
-    net::URLRequest* request,
-    net::NetworkDelegate* network_delegate) {
+void AwWebResourceResponse::JobDeliverResponseFromEmbedder(
+    AndroidStreamReaderURLRequestJob* job,
+    scoped_ptr<AwWebResourceResponse> aw_web_resource_response) {
   DCHECK(aw_web_resource_response);
-  DCHECK(request);
-  DCHECK(network_delegate);
-
-  return new AndroidStreamReaderURLRequestJob(
-      request,
-      network_delegate,
-      make_scoped_ptr(
-          new StreamReaderJobDelegateImpl(aw_web_resource_response.Pass())));
+  job->DeliverResponseFromDelegate(make_scoped_ptr(
+      new StreamReaderJobDelegateImpl(aw_web_resource_response.Pass())));
 }
 
 }  // namespace android_webview