Add gfx::GpuMemoryBuffer::shared_memory_handle()

ui/gfx/gpu_memory_buffer.cc

 // Copyright 2013 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/gfx/gpu_memory_buffer.h"
 
 #include "ui/gfx/generic_shared_memory_id.h"
 
 namespace gfx {
 
 GpuMemoryBufferHandle::GpuMemoryBufferHandle() : type(EMPTY_BUFFER), id(0) {}
 
 GpuMemoryBufferHandle::GpuMemoryBufferHandle(
     const GpuMemoryBufferHandle& other) = default;
 
 GpuMemoryBufferHandle::~GpuMemoryBufferHandle() {}
 
+base::SharedMemoryHandle GpuMemoryBuffer::shared_memory_handle() const {
+  return base::SharedMemoryHandle();
+}
+
 void GpuMemoryBuffer::SetColorSpaceForScanout(
     const gfx::ColorSpace& color_space) {}
 
 GpuMemoryBufferHandle CloneHandleForIPC(
     const GpuMemoryBufferHandle& source_handle) {
   switch (source_handle.type) {
     case gfx::EMPTY_BUFFER:
       NOTREACHED();
       return source_handle;
     case gfx::SHARED_MEMORY_BUFFER: {
@@ skipping 21 matching lines @@
   return gfx::GpuMemoryBufferHandle();
 }
 
 base::trace_event::MemoryAllocatorDumpGuid GpuMemoryBuffer::GetGUIDForTracing(
     uint64_t tracing_process_id) const {
   return gfx::GetGenericSharedGpuMemoryGUIDForTracing(tracing_process_id,
                                                       GetId());
 }
 
 }  // namespace gfx