ozone: Introduce ClientPixmap and ClientPixmapFactory for non-GPU processes.

ui/ozone/platform/drm/gbm_surface_client_factory.h

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef UI_OZONE_PLATFORM_DRM_GBM_SURFACE_CLIENT_FACTORY_H_
+#define UI_OZONE_PLATFORM_DRM_GBM_SURFACE_CLIENT_FACTORY_H_
+
+#include "ui/ozone/public/surface_client_factory_ozone.h"
+
+namespace ui {
+
+class GbmSurfaceClientFactory : public SurfaceClientFactoryOzone {
+ public:
+  GbmSurfaceClientFactory();
+  ~GbmSurfaceClientFactory() override;
+
+  // SurfaceClientFactoryOzone:
+  std::vector<Configuration> GetSupportedNativePixmapConfigurations()
+      const override;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(GbmSurfaceClientFactory);
+};
+
+}  // namespace ui
+
+#endif  // UI_OZONE_PLATFORM_DRM_GBM_SURFACE_CLIENT_FACTORY_H_