[Android] Expose showFileChooser in AwContentsClient interface

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,
   },
   'includes': [
     'android_webview_tests.gypi',
   ],
@@ skipping 67 matching lines @@
         '../components/components.gyp:autofill_content_renderer',
         '../components/components.gyp:navigation_interception',
         '../components/components.gyp:visitedlink_browser',
         '../components/components.gyp:visitedlink_renderer',
         '../components/components.gyp:web_contents_delegate_android',
         '../content/content.gyp:content',
         '../skia/skia.gyp:skia',
         '../gpu/gpu.gyp:command_buffer_service',
         '../gpu/gpu.gyp:gles2_implementation',
         '../ui/gl/gl.gyp:gl',
+        '../ui/ui.gyp:shell_dialogs',
         '../webkit/common/gpu/webkit_gpu.gyp:webkit_gpu',
         'android_webview_pak',
       ],
       'include_dirs': [
         '..',
         '../skia/config',
         '<(SHARED_INTERMEDIATE_DIR)/ui/ui_resources/',
       ],
       'sources': [
         'browser/aw_browser_context.cc',
@@ skipping 97 matching lines @@
         '../content/content.gyp:content_java',
         '../ui/ui.gyp:ui_java',
       ],
       'variables': {
         'java_in_dir': '../android_webview/java',
       },
       'includes': [ '../build/java.gypi' ],
     },
   ],
 }