exo: Implement wayland gamepad support

components/exo.gypi

Index: components/exo.gypi
diff --git a/components/exo.gypi b/components/exo.gypi
index 43e610c005d0bccf5def752ae6aea2ac3687c38f..5cb574dab881fac1146f73b500ecb6e44e5e4901 100644
--- a/components/exo.gypi
+++ b/components/exo.gypi
@@ -16,6 +16,7 @@
         '../base/base.gyp:base',
         '../cc/cc.gyp:cc',
         '../cc/cc.gyp:cc_surfaces',
+        # todo(denniskempin): add gyp dependency to /device/gamepad once it exists.

[reveman, 2016/06/27 17:30:34]

nit: not sure this is needed as it's pretty obvious that it should be added once
we start depending on compiled code in device/gamepad

[denniskempin, 2016/06/29 17:12:25]

done. I was just waiting for a gyp build file to be added to bajones@s CL. 

         '../gpu/gpu.gyp:gpu',
         '../skia/skia.gyp:skia',
         '../ui/aura/aura.gyp:aura',
@@ -35,6 +36,8 @@
         'exo/buffer.h',
         'exo/display.cc',
         'exo/display.h',
+        'exo/gamepads.cc',
+        'exo/gamepads.h',
         'exo/keyboard.cc',
         'exo/keyboard.h',
         'exo/keyboard_delegate.h',
@@ -73,6 +76,7 @@
             '../ipc/ipc.gyp:ipc',
             '../skia/skia.gyp:skia',
             '../third_party/wayland-protocols/wayland-protocols.gyp:alpha_compositing_protocol',
+            '../third_party/wayland-protocols/wayland-protocols.gyp:gamepads_protocol',
             '../third_party/wayland-protocols/wayland-protocols.gyp:remote_shell_protocol',
             '../third_party/wayland-protocols/wayland-protocols.gyp:secure_output_protocol',
             '../third_party/wayland-protocols/wayland-protocols.gyp:viewporter_protocol',