gpu: Add GpuFence framework.

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 2bc4755945117f8a3a484d02c9424ff4466676c0..d7c7f6ec1f27aa182ed192169d0681d34ccea174 100644
--- a/content/child/child_gpu_memory_buffer_manager.cc
+++ b/content/child/child_gpu_memory_buffer_manager.cc
@@ -7,8 +7,10 @@
 #include <memory>
 #include <utility>
 
+#include "base/memory/ptr_util.h"
 #include "content/common/child_process_messages.h"
 #include "content/common/generic_shared_memory_id_generator.h"
+#include "gpu/ipc/client/gpu_fence_impl.h"
 #include "gpu/ipc/client/gpu_memory_buffer_impl.h"
 
 namespace content {
@@ -84,4 +86,26 @@ void ChildGpuMemoryBufferManager::SetDestructionSyncToken(
       sync_token);
 }
 
+std::unique_ptr<gfx::GpuFence> ChildGpuMemoryBufferManager::CreateGpuFence() {
+  gfx::GpuFenceHandle handle;
+  IPC::Message* message = new ChildProcessHostMsg_SyncCreateGpuFence(&handle);
+  bool success = sender_->Send(message);
+  if (!success)
+    return nullptr;
+  std::unique_ptr<gpu::GpuFenceImpl> fence(new gpu::GpuFenceImpl(handle));
+  return std::move(fence);
+}
+
+std::unique_ptr<gfx::GpuFence>
+ChildGpuMemoryBufferManager::CreateGpuFenceFromHandle(
+    const gfx::GpuFenceHandle& handle) {
+  NOTIMPLEMENTED();
+  return nullptr;
+}
+
+gfx::GpuFence* ChildGpuMemoryBufferManager::GpuFenceFromClientFence(
+    ClientFence fence) {
+  return gpu::GpuFenceImpl::FromClientFence(fence);
+}
+
 }  // namespace content