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

ui/ozone/platform/drm/common/native_pixmap_manager_gbm.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_COMMON_NATIVE_PIXMAP_MANAGER_GBM_H_
+#define UI_OZONE_PLATFORM_DRM_COMMON_NATIVE_PIXMAP_MANAGER_GBM_H_
+
+#include "ui/ozone/public/native_pixmap_manager.h"
+
+namespace ui {
+
+// Constructor hook for use in constructor_list.cc
+NativePixmapManager* CreateNativePixmapManagerGbm();
+
+class NativePixmapManagerGbm : public NativePixmapManager {
+ public:
+  NativePixmapManagerGbm();
+  ~NativePixmapManagerGbm() override;
+
+  // NativePixmapManager:
+  void Initialize(const base::FileDescriptor& device_fd) override;
+  std::vector<Configuration> GetSupportedNativePixmapConfigurations()
+      const override;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(NativePixmapManagerGbm);
+};
+
+}  // namespace ui
+
+#endif  // UI_OZONE_PLATFORM_DRM_COMMON_NATIVE_PIXMAP_MANAGER_GBM_H_