Introduce background Download process to android

content/content_browser.gypi

 # 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.
 
 {
   'dependencies': [
     '../base/base.gyp:base_static',
     '../components/url_formatter/url_formatter.gyp:url_formatter',
     '../crypto/crypto.gyp:crypto',
     '../device/battery/battery.gyp:device_battery',
@@ skipping 1620 matching lines @@
         'browser/android/content_view_render_view.cc',
         'browser/android/content_view_render_view.h',
         'browser/android/content_view_statics.cc',
         'browser/android/content_view_statics.h',
         'browser/android/date_time_chooser_android.cc',
         'browser/android/date_time_chooser_android.h',
         'browser/android/deferred_download_observer.cc',
         'browser/android/deferred_download_observer.h',
         'browser/android/download_controller_android_impl.cc',
         'browser/android/download_controller_android_impl.h',
+        'browser/android/download_process_host.cc',
+        'browser/android/download_process_host.h',
         'browser/android/interstitial_page_delegate_android.cc',
         'browser/android/interstitial_page_delegate_android.h',
         'browser/android/load_url_params.cc',
         'browser/android/load_url_params.h',
         'browser/android/overscroll_controller_android.cc',
         'browser/android/overscroll_controller_android.h',
         'browser/android/popup_touch_handle_drawable.cc',
         'browser/android/popup_touch_handle_drawable.h',
         'browser/android/tracing_controller_android.cc',
         'browser/android/tracing_controller_android.h',
@@ skipping 564 matching lines @@
     ['enable_webvr==1 and OS=="android"', {
       'sources': [
         'browser/vr/android/cardboard/cardboard_vr_device.cc',
         'browser/vr/android/cardboard/cardboard_vr_device.h',
         'browser/vr/android/cardboard/cardboard_vr_device_provider.cc',
         'browser/vr/android/cardboard/cardboard_vr_device_provider.h',
       ],
     }],
   ],
 }