[Android WebView] Call shouldInterceptRequest on a background thread

android_webview/android_webview.gyp

 # Copyright 2009 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.
 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
     {
       'target_name': 'android_webview_pak',
@@ skipping 257 matching lines @@
         'browser/aw_printing_message_filter.cc',
         'browser/aw_printing_message_filter.h',
         'browser/aw_quota_manager_bridge.cc',
         'browser/aw_quota_manager_bridge.h',
         'browser/aw_quota_permission_context.cc',
         'browser/aw_quota_permission_context.h',
         'browser/aw_render_thread_context_provider.cc',
         'browser/aw_render_thread_context_provider.h',
         'browser/aw_request_interceptor.cc',
         'browser/aw_request_interceptor.h',
+        'browser/aw_request_handler.cc',
+        'browser/aw_request_handler.h',
         'browser/aw_resource_context.cc',
         'browser/aw_resource_context.h',
         'browser/aw_ssl_host_state_delegate.cc',
         'browser/aw_ssl_host_state_delegate.h',
         'browser/aw_result_codes.h',
         'browser/aw_web_preferences_populater.cc',
         'browser/aw_web_preferences_populater.h',
         'browser/aw_web_resource_response.cc',
         'browser/aw_web_resource_response.h',
         'browser/browser_view_renderer.cc',
@@ skipping 134 matching lines @@
         'java_in_dir': '../build/android/empty',
         'resource_dir': 'apk/java/res',
       },
       'includes': [ 'apk/system_webview_apk_common.gypi' ],
     },
   ],
   'includes': [
     'android_webview_tests.gypi',
   ],
 }