gpu: Add GpuFence framework.

ui/aura/mus/mojo_gpu_memory_buffer_manager.cc

 // Copyright 2015 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 "ui/aura/mus/mojo_gpu_memory_buffer_manager.h"
 
 #include "base/logging.h"
 #include "ui/aura/mus/mojo_gpu_memory_buffer.h"
 
 namespace aura {
@@ skipping 19 matching lines @@
   const gfx::BufferUsage usage = gfx::BufferUsage::GPU_READ;
   return MojoGpuMemoryBufferImpl::CreateFromHandle(handle, size, format, usage);
 }
 
 void MojoGpuMemoryBufferManager::SetDestructionSyncToken(
     gfx::GpuMemoryBuffer* buffer,
     const gpu::SyncToken& sync_token) {
   NOTIMPLEMENTED();
 }
 
+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 aura