ozone: Implement zero/one-copy texture for Ozone GBM.

ui/ozone/platform/drm/gpu/client_native_pixmap_vgem.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_GPU_CLIENT_NATIVE_PIXMAP_VGEM_H_
+#define UI_OZONE_PLATFORM_DRM_GPU_CLIENT_NATIVE_PIXMAP_VGEM_H_
+
+#include "base/file_descriptor_posix.h"
+#include "ui/gfx/geometry/size.h"
+#include "ui/gfx/native_pixmap_handle_ozone.h"
+#include "ui/ozone/public/client_native_pixmap.h"
+
+namespace ui {
+
+class ClientNativePixmapVgem : public ClientNativePixmap {
+ public:
+  static scoped_ptr<ClientNativePixmap> ImportFromDmabuf(int vgem_fd,
+                                                         int dmabuf_fd,
+                                                         const gfx::Size& size,
+                                                         int stride);
+
+  ~ClientNativePixmapVgem() override;
+
+  // Overridden from ClientNativePixmap.
+  void* Map() override;
+  void Unmap() override;
+  void GetStride(int* stride) const override;
+
+ private:
+  ClientNativePixmapVgem(int vgem_fd,
+                         uint32_t vgem_bo_handle,
+                         const gfx::Size& size,
+                         int stride);
+
+  const int vgem_fd_;
+  const uint32_t vgem_bo_handle_;
+  const gfx::Size size_;
+  const int stride_;
+  void* data_;
+
+  DISALLOW_COPY_AND_ASSIGN(ClientNativePixmapVgem);
+};
+
+}  // namespace ui
+
+#endif  // UI_OZONE_PLATFORM_DRM_GPU_CLIENT_NATIVE_PIXMAP_VGEM_H_