Add struct_traits and typemap for blink::WebGamepad

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 43 matching lines @@
     "bluetooth/test/mock_bluetooth_cbperipheral_mac.mm",
     "bluetooth/test/mock_bluetooth_cbservice_mac.h",
     "bluetooth/test/mock_bluetooth_cbservice_mac.mm",
     "bluetooth/test/mock_bluetooth_central_manager_mac.h",
     "bluetooth/test/mock_bluetooth_central_manager_mac.mm",
     "bluetooth/test/test_bluetooth_adapter_observer.cc",
     "bluetooth/test/test_bluetooth_adapter_observer.h",
     "bluetooth/test/test_bluetooth_local_gatt_service_delegate.cc",
     "bluetooth/test/test_bluetooth_local_gatt_service_delegate.h",
     "gamepad/gamepad_provider_unittest.cc",
+    "gamepad/public/interfaces/webgamepad_struct_traits_unittest.cc",
     "generic_sensor/platform_sensor_and_provider_unittest_win.cc",
     "generic_sensor/platform_sensor_provider_unittest.cc",
     "test/run_all_unittests.cc",
     "wake_lock/wake_lock_service_context_unittest.cc",
   ]
 
   deps = [
     "//base/test:test_support",
     "//base/third_party/dynamic_annotations:dynamic_annotations",
     "//device/base/synchronization",
     "//device/battery",
     "//device/battery:mojo_bindings",
     "//device/bluetooth",
     "//device/bluetooth:mocks",
     "//device/gamepad",
     "//device/gamepad:test_helpers",
+    "//device/gamepad/public/interfaces",
+    "//device/gamepad/public/interfaces:webgamepad_typemapping_test",
     "//device/generic_sensor",
     "//device/generic_sensor:testing",
     "//device/geolocation:unittests",
     "//device/power_save_blocker",
     "//device/wake_lock",
     "//mojo/common",
     "//mojo/edk/system",
     "//mojo/public/cpp/bindings",
     "//net",
     "//testing/gmock",
     "//testing/gtest",
+    "//third_party/WebKit/public:blink_headers",
     "//tools/usb_gadget",
     "//url",
   ]
 
   if (is_linux && !is_chromeos && use_dbus) {
     sources += [ "battery/battery_status_manager_linux_unittest.cc" ]
     deps += [ "//dbus:test_support" ]
   }
 
   if (is_linux) {
@@ skipping 178 matching lines @@
     ]
     srcjar_deps = [ "//device/gamepad:java_enums_srcjar" ]
   }
 
   java_cpp_enum("bluetooth_test_javagen") {
     sources = [
       "bluetooth/test/bluetooth_test.h",
     ]
   }
 }