ui: Add gfx::BufferUsage::SCANOUT_CPU_READ_WRITE.

gpu/ipc/common/gpu_memory_buffer_support.cc

 // Copyright 2016 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/common/gpu_memory_buffer_support.h"
 
 #include "base/logging.h"
 #include "build/build_config.h"
 
 #if defined(USE_OZONE)
@@ skipping 13 matching lines @@
 }
 
 bool IsNativeGpuMemoryBufferConfigurationSupported(gfx::BufferFormat format,
                                                    gfx::BufferUsage usage) {
   DCHECK_NE(gfx::SHARED_MEMORY_BUFFER, GetNativeGpuMemoryBufferType());
   DCHECK_NE(gfx::EMPTY_BUFFER, GetNativeGpuMemoryBufferType());
 #if defined(OS_MACOSX)
   switch (usage) {
     case gfx::BufferUsage::GPU_READ:
     case gfx::BufferUsage::SCANOUT:
+    case gfx::BufferUsage::SCANOUT_CPU_READ_WRITE:
       return format == gfx::BufferFormat::BGRA_8888 ||
              format == gfx::BufferFormat::RGBA_8888 ||
              format == gfx::BufferFormat::BGRX_8888;
     case gfx::BufferUsage::GPU_READ_CPU_READ_WRITE:
     case gfx::BufferUsage::GPU_READ_CPU_READ_WRITE_PERSISTENT:
       return format == gfx::BufferFormat::R_8 ||
              format == gfx::BufferFormat::BGRA_8888 ||
              format == gfx::BufferFormat::UYVY_422 ||
              format == gfx::BufferFormat::YUV_420_BIPLANAR;
   }
   NOTREACHED();
   return false;
 #endif
 
 #if defined(USE_OZONE)
   if (!ui::ClientNativePixmapFactory::GetInstance()) {
     // unittests don't have to set ClientNativePixmapFactory.
     return false;
   }
   return ui::ClientNativePixmapFactory::GetInstance()->IsConfigurationSupported(
       format, usage);
 #endif
 
   NOTREACHED();
   return false;
 }
 
 }  // namespace gpu