content: Pass IOSurface references using Mach IPC.

content/child/child_io_surface_manager_mac.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 CONTENT_CHILD_CHILD_IO_SURFACE_MANAGER_MAC_H_
+#define CONTENT_CHILD_CHILD_IO_SURFACE_MANAGER_MAC_H_
+
+#include "base/mac/scoped_mach_port.h"
+#include "base/macros.h"
+#include "base/memory/singleton.h"
+#include "content/common/mac/io_surface_manager.h"
+#include "gpu/command_buffer/common/mailbox.h"
+
+namespace content {
+
+// Implementation of IOSurfaceManager that registers and acquires IOSurfaces
+// through a Mach service.
+class CONTENT_EXPORT ChildIOSurfaceManager : public IOSurfaceManager {
+ public:
+  // Returns the global ChildIOSurfaceManager.
+  static ChildIOSurfaceManager* GetInstance();
+
+  // Overridden from IOSurfaceManager:
+  bool RegisterIOSurface(int io_surface_id,
+                         int client_id,
+                         IOSurfaceRef io_surface) override;
+  void UnregisterIOSurface(int io_surface_id, int client_id) override;
+  IOSurfaceRef AcquireIOSurface(int io_surface_id) override;
+
+  // Set the service Mach port.

[Robert Sesek, 2015/05/19 23:26:23]

Who's managing the ownership of this port?

[reveman, 2015/05/27 05:03:18]

Used to be the caller but I changed it in latest patch and added a comment.

+  void set_service_port(mach_port_t service_port) {
+    service_port_ = service_port;
+  }
+
+  // Set the mailbox used when communicating with the Mach service.
+  void set_mailbox(const gpu::Mailbox& mailbox) { mailbox_ = mailbox; }
+
+ private:
+  friend struct DefaultSingletonTraits<ChildIOSurfaceManager>;
+
+  ChildIOSurfaceManager();
+  ~ChildIOSurfaceManager() override;
+
+  mach_port_t service_port_;
+  gpu::Mailbox mailbox_;
+
+  DISALLOW_COPY_AND_ASSIGN(ChildIOSurfaceManager);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_CHILD_CHILD_IO_SURFACE_MANAGER_MAC_H_