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

ui/ozone/public/native_pixmap_manager.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_PUBLIC_NATIVE_PIXMAP_MANAGER_H_
+#define UI_OZONE_PUBLIC_NATIVE_PIXMAP_MANAGER_H_
+
+#include <vector>
+
+#include "ui/ozone/ozone_export.h"
+#include "ui/ozone/public/native_pixmap.h"
+#include "ui/ozone/public/surface_factory_ozone.h"
+
+namespace base {
+
+struct FileDescriptor;
+
+}  // namespace base
+
+namespace ui {
+
+// The Ozone interface allows external implementations to hook into Chromium to
+// provide a native pixmap for non-GPU processes.
+class OZONE_EXPORT NativePixmapManager {
+ public:
+  static NativePixmapManager* GetInstance();
+  static void SetInstance(NativePixmapManager* instance);
+
+  static scoped_ptr<NativePixmapManager> Create();
+
+  virtual ~NativePixmapManager();
+
+  struct Configuration {
+    SurfaceFactoryOzone::BufferFormat format;
+    SurfaceFactoryOzone::BufferUsage usage;
+  };
+
+  // Gets supported format/usage configurations.
+  virtual std::vector<Configuration> GetSupportedNativePixmapConfigurations()
+      const = 0;
+
+  // TODO(dshwang): implement it. crbug.com/475633
+  // Import the native pixmap from |handle| to be used in non-GPU processes.
+  virtual scoped_refptr<NativePixmap> ImportNativePixmap(
+      base::FileDescriptor handle,

[reveman, 2015/07/28 18:07:57]

nit: const base::FileDescriptor& handle

+      gfx::Size size,

[reveman, 2015/07/28 18:07:57]

nit: const gfx::Size& size

+      SurfaceFactoryOzone::BufferFormat format,
+      SurfaceFactoryOzone::BufferUsage usage) = 0;
+
+ protected:
+  NativePixmapManager();
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(NativePixmapManager);
+};
+
+}  // namespace ui
+
+#endif  // UI_OZONE_PUBLIC_NATIVE_PIXMAP_MANAGER_H_