ui: Add libsync GLFence implementation.

content/child/child_gpu_memory_buffer_manager.cc

Index: content/child/child_gpu_memory_buffer_manager.cc
diff --git a/content/child/child_gpu_memory_buffer_manager.cc b/content/child/child_gpu_memory_buffer_manager.cc
index 1d5c29f7ae5b1eb3d74afed1dff8992237b12972..766a864a3eebb9ddb33dad01b1a52ae6bc34e84d 100644
--- a/content/child/child_gpu_memory_buffer_manager.cc
+++ b/content/child/child_gpu_memory_buffer_manager.cc
@@ -98,7 +98,8 @@ std::unique_ptr<gfx::GpuFence> ChildGpuMemoryBufferManager::CreateGpuFence() {
   bool success = sender_->Send(message);
   if (!success)
     return nullptr;
-  std::unique_ptr<gpu::GpuFenceImpl> fence(new gpu::GpuFenceImpl(handle));
+  std::unique_ptr<gpu::GpuFenceImpl> fence(
+      gpu::GpuFenceImpl::CreateFromHandle(handle));
   return std::move(fence);
 }