ui: Add libsync GLFence implementation.

gpu/ipc/client/gpu_channel_host.cc

 // Copyright (c) 2012 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_channel_host.h"
 
 #include <algorithm>
 #include <utility>
 
 #include "base/atomic_sequence_num.h"
@@ skipping 268 matching lines @@
   }
 }
 
 int32_t GpuChannelHost::ReserveImageId() {
   return next_image_id_.GetNext();
 }
 
 gfx::GpuFenceHandle GpuChannelHost::ShareGpuFenceToGpuProcess(
     const gfx::GpuFenceHandle& source_handle) {
   gfx::GpuFenceHandle handle;
-  handle.shared_event_handle =
-      gfx::SharedEvent::DuplicateHandle(source_handle.shared_event_handle);
+  if (gfx::SharedEvent::IsHandleValid(source_handle.shared_event_handle)) {
+    handle.shared_event_handle =
+        gfx::SharedEvent::DuplicateHandle(source_handle.shared_event_handle);
+  }
+#if defined(OS_LINUX)
+  if (source_handle.fd.fd >= 0) {
+    handle.fd.fd = HANDLE_EINTR(dup(source_handle.fd.fd));
+    handle.fd.auto_close = true;
+  }
+#endif
   return handle;
 }
 
 int32_t GpuChannelHost::ReserveFenceId() {
   return next_fence_id_.GetNext();
 }
 
 int32_t GpuChannelHost::GenerateRouteID() {
   return next_route_id_.GetNext();
 }
@@ skipping 134 matching lines @@
 
   listeners_.clear();
 }
 
 bool GpuChannelHost::MessageFilter::IsLost() const {
   AutoLock lock(lock_);
   return lost_;
 }
 
 }  // namespace gpu