gpu: Add GpuFence framework.

services/ui/public/cpp/mojo_gpu_memory_buffer_manager.cc

Index: services/ui/public/cpp/mojo_gpu_memory_buffer_manager.cc
diff --git a/services/ui/public/cpp/mojo_gpu_memory_buffer_manager.cc b/services/ui/public/cpp/mojo_gpu_memory_buffer_manager.cc
index 27d3806b6063ce9f4d57bfb644093d67178d10ce..33b49ae8f702d5743b01d3fd16bc9d8f6b8bed13 100644
--- a/services/ui/public/cpp/mojo_gpu_memory_buffer_manager.cc
+++ b/services/ui/public/cpp/mojo_gpu_memory_buffer_manager.cc
@@ -133,4 +133,22 @@ void MojoGpuMemoryBufferManager::SetDestructionSyncToken(
       sync_token);
 }
 
+std::unique_ptr<gfx::GpuFence> MojoGpuMemoryBufferManager::CreateGpuFence() {
+  NOTIMPLEMENTED();
+  return nullptr;
+}
+
+std::unique_ptr<gfx::GpuFence>
+MojoGpuMemoryBufferManager::CreateGpuFenceFromHandle(
+    const gfx::GpuFenceHandle& handle) {
+  NOTIMPLEMENTED();
+  return nullptr;
+}
+
+gfx::GpuFence* MojoGpuMemoryBufferManager::GpuFenceFromClientFence(
+    ClientFence fence) {
+  NOTIMPLEMENTED();
+  return nullptr;
+}
+
 }  // namespace ui