[Android WebView] Call shouldInterceptRequest on a background thread

android_webview/browser/aw_web_resource_response.h

-// 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.
-
-#ifndef ANDROID_WEBVIEW_BROWSER_INTERCEPTED_REQUEST_DATA_H_
-#define ANDROID_WEBVIEW_BROWSER_INTERCEPTED_REQUEST_DATA_H_
-
-#include <string>
-
-#include "base/android/jni_android.h"
-#include "base/memory/scoped_ptr.h"
-
-namespace net {
-class HttpResponseHeaders;
-class NetworkDelegate;
-class URLRequest;
-class URLRequestJob;
-}
-
-namespace android_webview {
-
-class InputStream;
-
-// This class represents the Java-side data that is to be used to complete a
-// particular URLRequest.
-class AwWebResourceResponse {
- public:
-  virtual ~AwWebResourceResponse() {}
-
-  virtual scoped_ptr<InputStream> GetInputStream(JNIEnv* env) const = 0;
-  virtual bool GetMimeType(JNIEnv* env, std::string* mime_type) const = 0;
-  virtual bool GetCharset(JNIEnv* env, std::string* charset) const = 0;
-  virtual bool GetStatusInfo(JNIEnv* env,
-                             int* status_code,
-                             std::string* reason_phrase) const = 0;
-  // If true is returned then |headers| contain the headers, if false is
-  // returned |headers| were not updated.
-  virtual bool GetResponseHeaders(
-      JNIEnv* env,
-      net::HttpResponseHeaders* headers) const = 0;
-
-  // This creates a URLRequestJob for the |request| wich will read data from
-  // the |aw_web_resource_response| structure (instead of going to the network
-  // or to the cache).
-  // The newly created job takes ownership of |aw_web_resource_response|.
-  static net::URLRequestJob* CreateJobFor(
-      scoped_ptr<AwWebResourceResponse> aw_web_resource_response,
-      net::URLRequest* request,
-      net::NetworkDelegate* network_delegate);
-
- protected:
-  AwWebResourceResponse() {}
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(AwWebResourceResponse);
-};
-
-} // namespace android_webview
-
-#endif  // ANDROID_WEBVIEW_BROWSER_INTERCEPTED_REQUEST_DATA_H_