Prompt user for file access permission before download starts

chrome/chrome_browser.gypi

 # Copyright 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.
 
 {
   'variables': {
     # All .cc, .h, .m, and .mm files under browser except for:
     # * tests and mocks.
     # * code below browser/chromeos
     # * code below browser/extensions
@@ skipping 100 matching lines @@
       'browser/android/dom_distiller/external_feedback_reporter_android.cc',
       'browser/android/dom_distiller/external_feedback_reporter_android.h',
       'browser/android/download/android_download_manager_overwrite_infobar_delegate.cc',
       'browser/android/download/android_download_manager_overwrite_infobar_delegate.h',
       'browser/android/download/chrome_download_delegate.cc',
       'browser/android/download/chrome_download_delegate.h',
       'browser/android/download/chrome_download_manager_overwrite_infobar_delegate.cc',
       'browser/android/download/chrome_download_manager_overwrite_infobar_delegate.h',
       'browser/android/download/download_overwrite_infobar_delegate.cc',
       'browser/android/download/download_overwrite_infobar_delegate.h',
+      'browser/android/download/mock_download_controller_android.cc',
+      'browser/android/download/mock_download_controller_android.h',
       'browser/android/favicon_helper.cc',
       'browser/android/favicon_helper.h',
       'browser/android/feature_utilities.cc',
       'browser/android/feature_utilities.h',
       'browser/android/feedback/connectivity_checker.cc',
       'browser/android/feedback/connectivity_checker.h',
       'browser/android/find_in_page/find_in_page_bridge.cc',
       'browser/android/find_in_page/find_in_page_bridge.h',
       'browser/android/foreign_session_helper.cc',
       'browser/android/foreign_session_helper.h',
@@ skipping 3932 matching lines @@
           'variables': {
             'proto_in_dir': 'browser/sync_file_system/drive_backend',
             'proto_out_dir': 'chrome/browser/sync_file_system/drive_backend',
           },
           'includes': [ '../build/protoc.gypi' ]
         },
       ],
     },],
   ],
 }