Add NativePixmapHandle type & interface for exporting them

ui/ozone/common/stub_client_native_pixmap_factory.cc

Index: ui/ozone/common/stub_client_native_pixmap_factory.cc
diff --git a/ui/ozone/common/stub_client_native_pixmap_factory.cc b/ui/ozone/common/stub_client_native_pixmap_factory.cc
index 2b74cf81cce4733f873d9f1b959494fec3d884ae..423ea723100d2f9ea2352e7ef986ff02bc4fdd85 100644
--- a/ui/ozone/common/stub_client_native_pixmap_factory.cc
+++ b/ui/ozone/common/stub_client_native_pixmap_factory.cc
@@ -5,6 +5,7 @@
 #include "ui/ozone/common/stub_client_native_pixmap_factory.h"
 
 #include "base/file_descriptor_posix.h"
+#include "ui/gfx/native_pixmap_handle_ozone.h"
 
 namespace ui {
 
@@ -19,12 +20,12 @@ class StubClientNativePixmapFactory : public ClientNativePixmapFactory {
   std::vector<Configuration> GetSupportedConfigurations() const override {
     return std::vector<Configuration>();
   }
-  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 {
-    NOTIMPLEMENTED();
+    NOTREACHED();
     return nullptr;
   }