exo: Implement wayland gamepad support

components/exo/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/ui.gni")
 import("//testing/test.gni")
 
 source_set("exo") {
   sources = [
     "buffer.cc",
     "buffer.h",
     "display.cc",
     "display.h",
+    "gamepads.cc",
+    "gamepads.h",
     "keyboard.cc",
     "keyboard.h",
     "keyboard_delegate.h",
     "pointer.cc",
     "pointer.h",
     "pointer_delegate.h",
     "shared_memory.cc",
     "shared_memory.h",
     "shell_surface.cc",
     "shell_surface.h",
     "sub_surface.cc",
     "sub_surface.h",
     "surface.cc",
     "surface.h",
     "surface_delegate.h",
     "surface_observer.h",
     "surface_property.h",
     "touch.cc",
     "touch.h",
     "touch_delegate.h",
   ]
 
   deps = [
     "//ash",
     "//base",
     "//cc",
     "//cc/surfaces:surfaces",
+    "//device/gamepad",
     "//gpu",
     "//gpu/command_buffer/client:gles2_interface",
     "//skia",
     "//ui/aura",
     "//ui/compositor",
     "//ui/gfx",
     "//ui/gfx/geometry",
     "//ui/gl",
     "//ui/views",
     "//ui/wm:wm",
@@ skipping 22 matching lines @@
     "//ui/wm:wm",
   ]
 }
 
 source_set("unit_tests") {
   testonly = true
 
   sources = [
     "buffer_unittest.cc",
     "display_unittest.cc",
+    "gamepads_unittest.cc",
     "keyboard_unittest.cc",
     "pointer_unittest.cc",
     "shared_memory_unittest.cc",
     "shell_surface_unittest.cc",
     "sub_surface_unittest.cc",
     "surface_unittest.cc",
     "touch_unittest.cc",
   ]
 
   deps = [
@@ skipping 24 matching lines @@
 
 test("exo_unittests") {
   sources = [
     "test/run_all_unittests.cc",
   ]
   deps = [
     ":unit_tests",
     "//ash:test_support",
     "//base",
     "//base/test:test_support",
+    "//device/gamepad:test_helpers",
   ]
   if (is_linux) {
     deps += [ "//components/exo/wayland:unit_tests" ]
   }
 }