Add NativePixmapHandle type & interface for exporting them

ui/ozone/platform/drm/common/client_native_pixmap_factory_gbm.cc

Index: ui/ozone/platform/drm/common/client_native_pixmap_factory_gbm.cc
diff --git a/ui/ozone/platform/drm/common/client_native_pixmap_factory_gbm.cc b/ui/ozone/platform/drm/common/client_native_pixmap_factory_gbm.cc
index ca150e5d56c78d153ab489185dd7716d85758f91..1dbb94d7908b85242ff3ed265b1be00733eed640 100644
--- a/ui/ozone/platform/drm/common/client_native_pixmap_factory_gbm.cc
+++ b/ui/ozone/platform/drm/common/client_native_pixmap_factory_gbm.cc
@@ -25,8 +25,8 @@ class ClientNativePixmapFactoryGbm : public ClientNativePixmapFactory {
         kConfiguratioins, kConfiguratioins + arraysize(kConfiguratioins));
     return configurations;
   }
-  scoped_ptr<ClientNativePixmap> ImportNativePixmap(
-      const base::FileDescriptor& handle,
+  scoped_ptr<ClientNativePixmap> ImportFromHandle(
+      const gfx::NativePixmapHandle& handle,
       const gfx::Size& size,
       gfx::BufferFormat format,
       gfx::BufferUsage usage) override {