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

ui/gfx/mac/io_surface.h

Index: ui/gfx/mac/io_surface.h
diff --git a/ui/gfx/mac/io_surface.h b/ui/gfx/mac/io_surface.h
new file mode 100644
index 0000000000000000000000000000000000000000..04ecf5f1109d2fc4601d6bbd99b59b9e1276e6a6
--- /dev/null
+++ b/ui/gfx/mac/io_surface.h
@@ -0,0 +1,24 @@
+// 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 "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 {
+
+using IOSurfaceId = GenericSharedMemoryId;
+
+// Helper function to create an IOSurface with a specified size and format.
+GFX_EXPORT IOSurfaceRef CreateIOSurface(const Size& size, BufferFormat format);
+
+}  // namespace content
+
+#endif  // UI_GFX_MAC_IO_SURFACE_H_