NOT for review (for discussion): Query IOSurfaceIsInUse in the browser process

gpu/ipc/client/gpu_memory_buffer_impl_io_surface.cc

 // Copyright 2013 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.
 
 #include "gpu/ipc/client/gpu_memory_buffer_impl_io_surface.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
 #include "gpu/ipc/common/gpu_memory_buffer_support.h"
@@ skipping 109 matching lines @@
       gfx::ICCProfile::FromColorSpace(color_space).GetData();
   if (icc_profile.size()) {
     base::ScopedCFTypeRef<CFDataRef> cf_data_icc_profile(CFDataCreate(
         nullptr, reinterpret_cast<const UInt8*>(icc_profile.data()),
         icc_profile.size()));
     IOSurfaceSetValue(io_surface_, CFSTR("IOSurfaceColorSpace"),
                       cf_data_icc_profile);
   }
 }
 
+bool GpuMemoryBufferImplIOSurface::IsInUseByMacOSWindowServer() const {
+  return IOSurfaceIsInUse(io_surface_);
+}
+
 gfx::GpuMemoryBufferHandle GpuMemoryBufferImplIOSurface::GetHandle() const {
   gfx::GpuMemoryBufferHandle handle;
   handle.type = gfx::IO_SURFACE_BUFFER;
   handle.id = id_;
   return handle;
 }
 
 }  // namespace gpu