Make cross-process CALayers work on Mac

content/common/gpu/surface_handle_types_mac.h

+// Copyright 2014 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 CONTENT_COMMON_GPU_SURFACE_HANDLE_TYPES_MAC_H_
+#define CONTENT_COMMON_GPU_SURFACE_HANDLE_TYPES_MAC_H_
+
+#include <OpenGL/CGLIOSurface.h>
+
+#include "base/basictypes.h"
+#include "ui/base/cocoa/remote_layer_api.h"
+
+namespace content {
+
+// The surface handle passed between the GPU and browser process may refer to
+// an IOSurface or a CAContext. These helper functions must be used to identify
+// and translate between the types.
+enum SurfaceHandleType {
+  kSurfaceHandleTypeInvalid,
+  kSurfaceHandleTypeIOSurface,
+  kSurfaceHandleTypeCAContext,
+};
+
+SurfaceHandleType GetSurfaceHandleType(uint64 surface_handle);
+
+CAContextID CAContextIDFromSurfaceHandle(uint64 surface_handle);
+IOSurfaceID IOSurfaceIDFromSurfaceHandle(uint64 surface_handle);
+
+uint64 SurfaceHandleFromIOSurfaceID(IOSurfaceID io_surface_id);
+uint64 SurfaceHandleFromCAContextID(CAContextID ca_context_id);
+
+}  //  namespace content
+
+#endif // CONTENT_COMMON_GPU_HANDLE_TYPES_MAC_H_