Replace IOSurfaceManager by directly passing IOSurface Mach ports over Chrome IPC.

ui/gfx/mac/io_surface.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_GFX_MAC_IO_SURFACE_H_
+#define UI_GFX_MAC_IO_SURFACE_H_
+
+#include <IOSurface/IOSurface.h>
+#include <mach/mach.h>
+
+#include "base/mac/scoped_cftyperef.h"
+#include "ui/gfx/buffer_types.h"
+#include "ui/gfx/generic_shared_memory_id.h"
+#include "ui/gfx/geometry/size.h"
+#include "ui/gfx/gfx_export.h"
+
+namespace gfx {
+
+namespace internal {
+
+struct IOSurfaceMachPortTraits {
+  GFX_EXPORT static mach_port_t InvalidValue() { return MACH_PORT_NULL; }
+  GFX_EXPORT static mach_port_t Retain(mach_port_t);
+  GFX_EXPORT static void Release(mach_port_t);
+};
+
+}  // namespace internal
+
+using IOSurfaceId = GenericSharedMemoryId;
+
+// Helper function to create an IOSurface with a specified size and format.
+GFX_EXPORT IOSurfaceRef CreateIOSurface(const Size& size, BufferFormat format);
+
+// A scoper for handling Mach port names that are send rights for IOSurfaces.
+// This scoper is both copyable and assignable, which will increase the kernel
+// reference count of the right. On destruction, the reference count is
+// decremented.
+using ScopedRefCountedIOSurfaceMachPort =
+    base::ScopedTypeRef<mach_port_t, internal::IOSurfaceMachPortTraits>;
+
+}  // namespace gfx
+
+#endif  // UI_GFX_MAC_IO_SURFACE_H_