Add DownloadControllerAndroid public interface for 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': [
     'browser/speech/proto/speech_proto.gyp:speech_proto',
     '../base/base.gyp:base_static',
     '../crypto/crypto.gyp:crypto',
     '../google_apis/google_apis.gyp:google_apis',
     '../net/net.gyp:net',
     '../skia/skia.gyp:skia',
     '../third_party/zlib/zlib.gyp:zlib',
     '../ui/ui.gyp:ui',
     '../ui/ui.gyp:ui_resources',
   ],
   'include_dirs': [
     '..',
     '<(INTERMEDIATE_DIR)',
   ],
   'sources': [
     'port/browser/render_view_host_delegate_view.h',
     'port/browser/render_widget_host_view_port.h',
     'port/browser/smooth_scroll_gesture.h',
     'public/browser/access_token_store.h',
     'public/browser/android/compositor.h',
     'public/browser/android/content_view_core.h',
     'public/browser/android/devtools_auth.h',
+    'public/browser/android/download_controller_android.h',
     'public/browser/android/draw_delegate.h',
     'public/browser/browser_accessibility_state.h',
     'public/browser/browser_child_process_host.h',
     'public/browser/browser_child_process_host_delegate.cc',
     'public/browser/browser_child_process_host_delegate.h',
     'public/browser/browser_child_process_host_iterator.cc',
     'public/browser/browser_child_process_host_iterator.h',
     'public/browser/browser_context.h',
     'public/browser/browser_main_parts.cc',
     'public/browser/browser_main_parts.h',
@@ skipping 159 matching lines @@
     'browser/android/content_startup_flags.cc',
     'browser/android/content_startup_flags.h',
     'browser/android/content_video_view.cc',
     'browser/android/content_video_view.h',
     'browser/android/content_view_core_impl.cc',
     'browser/android/content_view_core_impl.h',
     'browser/android/content_view_statics.cc',
     'browser/android/content_view_statics.h',
     'browser/android/cookie_getter_impl.cc',
     'browser/android/cookie_getter_impl.h',
-    'browser/android/download_controller.cc',
-    'browser/android/download_controller.h',
+    'browser/android/download_controller_android_impl.cc',
+    'browser/android/download_controller_android_impl.h',
     'browser/android/devtools_auth.cc',
     'browser/android/draw_delegate_impl.h',
     'browser/android/draw_delegate_impl.cc',
     'browser/android/load_url_params.cc',
     'browser/android/load_url_params.h',
     'browser/android/media_player_manager_android.cc',
     'browser/android/media_player_manager_android.h',
     'browser/android/sandboxed_process_launcher.cc',
     'browser/android/sandboxed_process_launcher.h',
     'browser/android/surface_texture_peer_browser_impl.cc',
@@ skipping 852 matching lines @@
         ['exclude', '^browser/renderer_host/java/'],
       ],
     }],
     ['input_speech==0', {
       'sources/': [
         ['exclude', '^browser/speech/'],
       ],
     }],
   ],
 }