Implement basic USB device enumeration on 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 1848 matching lines @@
       'dependencies': [
         'app/resources/content_resources.gyp:content_resources',
         'app/strings/content_strings.gyp:content_strings',
         'browser/devtools/devtools_resources.gyp:devtools_resources',
         'browser/devtools/devtools.gyp:devtools_protocol_handler',
         '../cc/cc.gyp:cc',
         '../cc/cc.gyp:cc_surfaces',
         '../components/mime_util/mime_util.gyp:mime_util',
         '../components/scheduler/scheduler.gyp:scheduler_common',
         '../device/bluetooth/bluetooth.gyp:device_bluetooth',
+        '../device/usb/usb.gyp:device_usb',
         '../gin/gin.gyp:gin',
         '../net/net.gyp:http_server',
         '../storage/storage_browser.gyp:storage',
         '../storage/storage_common.gyp:storage_common',
         '../third_party/angle/src/angle.gyp:commit_id',
         '../third_party/leveldatabase/leveldatabase.gyp:leveldatabase',
         '../third_party/mojo/mojo_public.gyp:mojo_cpp_bindings',
         '../third_party/mojo/mojo_public.gyp:mojo_js_bindings',
         '../ui/events/blink/events_blink.gyp:events_blink',
         '../ui/surface/surface.gyp:surface',
@@ skipping 328 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',
       ],
     }],
   ],
 }