[Android WebView] Call shouldInterceptRequest on a background thread

android_webview/browser/net/android_stream_reader_url_request_job.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_NATIVE_ANDROID_STREAM_READER_URL_REQUEST_JOB_H_
 #define ANDROID_WEBVIEW_NATIVE_ANDROID_STREAM_READER_URL_REQUEST_JOB_H_
 
 #include <string>
 
 #include "base/android/scoped_java_ref.h"
@@ skipping 56 matching lines @@
         std::string* charset) = 0;
 
     virtual void AppendResponseHeaders(JNIEnv* env,
                                        net::HttpResponseHeaders* headers) = 0;
 
     virtual ~Delegate() {}
   };
 
   AndroidStreamReaderURLRequestJob(
       net::URLRequest* request,
+      net::NetworkDelegate* network_delegate);
+   AndroidStreamReaderURLRequestJob(
+      net::URLRequest* request,
       net::NetworkDelegate* network_delegate,
       scoped_ptr<Delegate> delegate);
+  void DeliverResponseFromDelegate(scoped_ptr<Delegate> delegate);
+  void DeliverResponseFromNetwork();
+  void MaybeStart();
 
   // URLRequestJob:
   void Start() override;
   void Kill() override;
   bool ReadRawData(net::IOBuffer* buf, int buf_size, int* bytes_read) override;
   void SetExtraRequestHeaders(const net::HttpRequestHeaders& headers) override;
   bool GetMimeType(std::string* mime_type) const override;
   bool GetCharset(std::string* charset) override;
   int GetResponseCode() const override;
   void GetResponseInfo(net::HttpResponseInfo* info) override;
@@ skipping 26 matching lines @@
   base::ThreadChecker thread_checker_;
 
   base::WeakPtrFactory<AndroidStreamReaderURLRequestJob> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(AndroidStreamReaderURLRequestJob);
 };
 
 }  // namespace android_webview
 
 #endif  // ANDROID_WEBVIEW_NATIVE_ANDROID_STREAM_READER_URL_REQUEST_JOB_H_