Add gfx::GpuMemoryBuffer::shared_memory_handle()

gpu/ipc/client/gpu_memory_buffer_impl_shared_memory.cc

 // Copyright 2014 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 "gpu/ipc/client/gpu_memory_buffer_impl_shared_memory.h"
 
 #include <stdint.h>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 148 matching lines @@
 // static
 base::Closure GpuMemoryBufferImplSharedMemory::AllocateForTesting(
     const gfx::Size& size,
     gfx::BufferFormat format,
     gfx::BufferUsage usage,
     gfx::GpuMemoryBufferHandle* handle) {
   *handle = CreateGpuMemoryBuffer(handle->id, size, format);
   return base::Bind(&base::DoNothing);
 }
 
+base::SharedMemoryHandle GpuMemoryBufferImplSharedMemory::shared_memory_handle()
+    const {
+  if (!shared_memory_)
+    return base::SharedMemoryHandle();
+  return shared_memory_->handle();
+}
+
 bool GpuMemoryBufferImplSharedMemory::Map() {
   DCHECK(!mapped_);
 
   // Map the buffer first time Map() is called then keep it mapped for the
   // lifetime of the buffer. This avoids mapping the buffer unless necessary.
   if (!shared_memory_->memory()) {
     DCHECK_EQ(static_cast<size_t>(stride_),
               gfx::RowSizeForBufferFormat(size_.width(), format_, 0));
     size_t buffer_size = gfx::BufferSizeForBufferFormat(size_, format_);
     // Note: offset_ != 0 is not common use-case. To keep it simple we
@@ skipping 33 matching lines @@
   return handle;
 }
 
 base::trace_event::MemoryAllocatorDumpGuid
 GpuMemoryBufferImplSharedMemory::GetGUIDForTracing(
     uint64_t tracing_process_id) const {
   return gfx::GetSharedMemoryGUIDForTracing(tracing_process_id, id_);
 }
 
 }  // namespace gpu