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/surface_factory_ozone.h"
+
+namespace base {
+
+struct FileDescriptor;
+
+}  // namespace base
+
+namespace ui {
+
+// The Ozone interface allows external implementations to hook into Chromium to
+// provide the handle of a system specific surface implementation for Browser
+// and Render process.
+class OZONE_EXPORT NativePixmapManager {

[dshwang, 2015/07/06 18:45:01]

OzoneNativeBuffer
As I mentioned earlier, I'll rename GpuMemoryBufferImplOzoneNativeBuffer to
GpuMemoryBufferImplOzone, instead of renaming here.
It's because
1. the term "NativePixmap" is widely used in ozone code already.
2. GpuMemoryBufferImplOzone is ozone implementation of GpuMemoryBufferImpl.
Prefix "NativeBuffer" is redundant.

+ public:
+  static NativePixmapManager* GetInstance();
+  static void SetInstance(NativePixmapManager* instance);
+
+  static scoped_ptr<NativePixmapManager> Create(
+      const base::FileDescriptor& device_fd);
+
+  virtual ~NativePixmapManager();
+
+  struct Configuration {
+    SurfaceFactoryOzone::BufferFormat format;
+    SurfaceFactoryOzone::BufferUsage usage;
+  };
+
+  // Gets supported format/usage configurations.
+  virtual std::vector<Configuration> GetSupportedNativePixmapConfigurations()
+      const = 0;
+
+ protected:
+  NativePixmapManager();
+
+  virtual void Initialize(const base::FileDescriptor& device_fd) = 0;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(NativePixmapManager);
+};
+
+// Platforms which don't need to share native pixmap use this.
+NativePixmapManager* CreateStubNativePixmapManager();
+
+}  // namespace ui
+
+#endif  // UI_OZONE_PUBLIC_NATIVE_PIXMAP_MANAGER_H_