Support USB device hotplug on Android.

device/BUILD.gn

 # Copyright 2015 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.
 
 import("//build/config/features.gni")
 import("//testing/test.gni")
 
 if (is_android) {
   import("//build/config/android/rules.gni")  # For generate_jni().
 }
@@ skipping 132 matching lines @@
   if (is_mac || is_win) {
     sources += [ "usb/usb_context_unittest.cc" ]
     deps += [ "//third_party/libusb" ]
   }
 
   if (is_android) {
     sources -= [ "battery/battery_status_service_unittest.cc" ]
     deps += [
       ":bluetooth_test_java",
       ":bluetooth_test_jni_headers",
+      "//device/usb:java",
     ]
     deps -= [ "//device/battery" ]
   }
 
   if (is_chromeos) {
     deps += [
       "//chromeos",
       "//chromeos:test_support",
       "//chromeos:test_support_without_gmock",
     ]
@@ skipping 56 matching lines @@
   }
 
   android_library("bluetooth_test_java") {
     java_files = bluetooth_java_sources_needing_jni
     deps = [
       "//base:base_java",
       "//device/bluetooth:java",
     ]
   }
 }