Add NaCl proxy for pepper gamepad

ppapi/native_client/src/shared/ppapi_proxy/browser_globals.cc

Index: ppapi/native_client/src/shared/ppapi_proxy/browser_globals.cc
diff --git a/ppapi/native_client/src/shared/ppapi_proxy/browser_globals.cc b/ppapi/native_client/src/shared/ppapi_proxy/browser_globals.cc
index 87e170e28eba20c1063ccbcd3dee0e6e76da20f4..06b18432b9877158daa24cb71cdc394fdc9baa0b 100644
--- a/ppapi/native_client/src/shared/ppapi_proxy/browser_globals.cc
+++ b/ppapi/native_client/src/shared/ppapi_proxy/browser_globals.cc
@@ -375,6 +375,13 @@ const PPB_Fullscreen* PPBFullscreenInterface() {
   return ppb;
 }
 
+const PPB_Gamepad_Dev* PPBGamepadInterface() {
+  static const PPB_Gamepad_Dev* ppb =
+      static_cast<const PPB_Gamepad_Dev*>(
+          GetBrowserInterfaceSafe(PPB_GAMEPAD_DEV_INTERFACE));
+  return ppb;
+}
+
 const PPB_MouseLock* PPBMouseLockInterface() {
   static const PPB_MouseLock* ppb = static_cast<const PPB_MouseLock*>(
       GetBrowserInterfaceSafe(PPB_MOUSELOCK_INTERFACE));