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

ui/ozone/public/client_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_CLIENT_PIXMAP_MANAGER_H_
+#define UI_OZONE_PUBLIC_CLIENT_PIXMAP_MANAGER_H_
+
+#include <vector>
+
+#include "base/memory/scoped_ptr.h"
+#include "ui/gfx/geometry/size.h"
+#include "ui/ozone/ozone_export.h"
+#include "ui/ozone/public/client_pixmap.h"
+#include "ui/ozone/public/pixmap_types.h"
+
+namespace base {
+
+struct FileDescriptor;
+
+}  // namespace base
+
+namespace ui {
+
+// The Ozone interface allows external implementations to hook into Chromium to
+// provide a client pixmap for non-GPU processes.
+class OZONE_EXPORT ClientPixmapManager {
+ public:
+  static ClientPixmapManager* GetInstance();
+  static void SetInstance(ClientPixmapManager* instance);
+
+  static scoped_ptr<ClientPixmapManager> Create();
+
+  virtual ~ClientPixmapManager();
+
+  struct Configuration {
+    PixmapFormat format;
+    PixmapUsage usage;
+  };
+
+  // Gets supported format/usage configurations.
+  virtual std::vector<Configuration> GetSupportedConfigurations() const = 0;
+
+  // TODO(dshwang): implement it. crbug.com/475633
+  // Import the native pixmap from |handle| to be used in non-GPU processes.
+  virtual scoped_ptr<ClientPixmap> ImportClientPixmap(
+      base::FileDescriptor handle,
+      gfx::Size size,
+      PixmapFormat format,
+      PixmapUsage usage) = 0;
+
+ protected:
+  ClientPixmapManager();
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ClientPixmapManager);
+};
+
+}  // namespace ui
+
+#endif  // UI_OZONE_PUBLIC_CLIENT_PIXMAP_MANAGER_H_