Add GenericSharedMemoryId and use w/ GpuMemoryBuffer

content/browser/browser_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_BROWSER_BROWSER_IO_SURFACE_MANAGER_MAC_H_
 #define CONTENT_BROWSER_BROWSER_IO_SURFACE_MANAGER_MAC_H_
 
 #include <mach/mach.h>
 
 #include <map>
 #include <utility>
 
 #include "base/containers/scoped_ptr_hash_map.h"
 #include "base/mac/dispatch_source_mach.h"
 #include "base/mac/scoped_mach_port.h"
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/singleton.h"
 #include "base/synchronization/lock.h"
 #include "content/common/content_export.h"
 #include "content/common/mac/io_surface_manager.h"
 #include "content/common/mac/io_surface_manager_messages.h"
 #include "content/common/mac/io_surface_manager_token.h"
 
 namespace content {
 
+// TODO(ericrk): Use gfx::GenericSharedMemoryTracingId as the |io_surface_id| in
+// this file. Allows for more type-safe usage of GpuMemoryBufferIds as the
+// type of the |io_surface_id|, as it is a typedef of
+// gfx::GenericSharedMemoryTracingId.
+
 // Implementation of IOSurfaceManager that provides a mechanism for child
 // processes to register and acquire IOSurfaces through a Mach service.
 class CONTENT_EXPORT BrowserIOSurfaceManager : public IOSurfaceManager {
  public:
   // Returns the global BrowserIOSurfaceManager.
   static BrowserIOSurfaceManager* GetInstance();
 
   // Look up the IOSurfaceManager service port that's been registered with
   // the bootstrap server. |pid| is the process ID of the service.
   static base::mac::ScopedMachSendRight LookupServicePort(pid_t pid);
@@ skipping 74 matching lines @@
   // Mutex that guards |initialized_|, |io_surfaces_|, |child_process_ids_|
   // and |gpu_process_token_|.
   base::Lock lock_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserIOSurfaceManager);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_BROWSER_IO_SURFACE_MANAGER_MAC_H_