ui: Add gfx::BufferUsage::SCANOUT_CPU_READ_WRITE.

gpu/ipc/client/gpu_memory_buffer_impl_io_surface.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 "gpu/ipc/client/gpu_memory_buffer_impl_io_surface.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
 #include "gpu/ipc/common/gpu_memory_buffer_support.h"
 #include "ui/gfx/buffer_format_util.h"
 #include "ui/gfx/icc_profile.h"
 #include "ui/gfx/mac/io_surface.h"
 
 namespace gpu {
 namespace {
 
 uint32_t LockFlags(gfx::BufferUsage usage) {
   switch (usage) {
     case gfx::BufferUsage::GPU_READ_CPU_READ_WRITE:
       return kIOSurfaceLockAvoidSync;
     case gfx::BufferUsage::GPU_READ:
     case gfx::BufferUsage::SCANOUT:
+    case gfx::BufferUsage::SCANOUT_CPU_READ_WRITE:
     case gfx::BufferUsage::GPU_READ_CPU_READ_WRITE_PERSISTENT:
       return 0;
   }
   NOTREACHED();
   return 0;
 }
 
 void NoOp() {}
 
 }  // namespace
@@ skipping 99 matching lines @@
 }
 
 gfx::GpuMemoryBufferHandle GpuMemoryBufferImplIOSurface::GetHandle() const {
   gfx::GpuMemoryBufferHandle handle;
   handle.type = gfx::IO_SURFACE_BUFFER;
   handle.id = id_;
   return handle;
 }
 
 }  // namespace gpu