Revert of Revert of Make SharedMemoryHandle a class on Mac.

content/browser/renderer_host/media/video_capture_buffer_pool.cc

 // Copyright (c) 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 "content/browser/renderer_host/media/video_capture_buffer_pool.h"
 
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/stl_util.h"
 #include "content/browser/gpu/browser_gpu_memory_buffer_manager.h"
@@ skipping 52 matching lines @@
  public:
   SimpleBufferHandle(void* data, size_t size, base::SharedMemoryHandle handle)
       : data_(data), size_(size), handle_(handle) {}
   ~SimpleBufferHandle() override {}
 
   size_t size() const override { return size_; }
   void* data() override { return data_; }
   ClientBuffer AsClientBuffer() override { return nullptr; }
 #if defined(OS_POSIX)
   base::FileDescriptor AsPlatformFile() override {
+#if defined(OS_MACOSX)
+    return handle_.GetFileDescriptor();
+#else
     return handle_;
+#endif  // defined(OS_MACOSX)
   }
 #endif
 
  private:
   void* const data_;
   const size_t size_;
   const base::SharedMemoryHandle handle_;
 };
 
 // A holder of a GpuMemoryBuffer-backed buffer, Map()ed on ctor and Unmap()ed on
@@ skipping 11 matching lines @@
     DCHECK(gmb && !gmb_->IsMapped());
     gmb_->Map(data_.get());
   }
   ~GpuMemoryBufferBufferHandle() override { gmb_->Unmap(); }
 
   size_t size() const override { return size_; }
   void* data() override { return data_[0]; }
   ClientBuffer AsClientBuffer() override { return gmb_->AsClientBuffer(); }
 #if defined(OS_POSIX)
   base::FileDescriptor AsPlatformFile() override {
+#if defined(OS_MACOSX)
+    return gmb_->GetHandle().handle.GetFileDescriptor();
+#else
     return gmb_->GetHandle().handle;
+#endif  // defined(OS_MACOSX)
   }
 #endif
 
  private:
   gfx::GpuMemoryBuffer* const gmb_;
   scoped_ptr<void*[]> data_;
   const size_t size_;
 };
 
 // Tracker specifics for SharedMemory.
@@ skipping 281 matching lines @@
   return buffer_id;
 }
 
 VideoCaptureBufferPool::Tracker* VideoCaptureBufferPool::GetTracker(
     int buffer_id) {
   TrackerMap::const_iterator it = trackers_.find(buffer_id);
   return (it == trackers_.end()) ? NULL : it->second;
 }
 
 }  // namespace content