Add NativePixmapHandle type & interface for exporting them

ui/ozone/public/client_native_pixmap_factory.h

Index: ui/ozone/public/client_native_pixmap_factory.h
diff --git a/ui/ozone/public/client_native_pixmap_factory.h b/ui/ozone/public/client_native_pixmap_factory.h
index 1f216018d19b99818273b6db1bf2e482cb3ea4b4..388e0a47b6f40a79a7f25b6d2a3d68d1202a7232 100644
--- a/ui/ozone/public/client_native_pixmap_factory.h
+++ b/ui/ozone/public/client_native_pixmap_factory.h
@@ -42,8 +42,8 @@ class OZONE_EXPORT ClientNativePixmapFactory {
 
   // TODO(dshwang): implement it. crbug.com/475633
   // Import the native pixmap from |handle| to be used in non-GPU processes.
-  virtual scoped_ptr<ClientNativePixmap> ImportNativePixmap(
-      const base::FileDescriptor& handle,
+  virtual scoped_ptr<ClientNativePixmap> ImportFromHandle(
+      const gfx::NativePixmapHandle& handle,
       const gfx::Size& size,
       gfx::BufferFormat format,
       gfx::BufferUsage usage) = 0;