ui: Revert gfx::BufferUsage::SCANOUT to gfx::BufferUsage::GPU_READ_WRITE change.

content/common/gpu/gpu_memory_buffer_factory_io_surface.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 "content/common/gpu/gpu_memory_buffer_factory_io_surface.h"
 
 #include <CoreFoundation/CoreFoundation.h>
 
 #include <vector>
 
@@ skipping 81 matching lines @@
 
 GpuMemoryBufferFactoryIOSurface::~GpuMemoryBufferFactoryIOSurface() {
 }
 
 // static
 bool GpuMemoryBufferFactoryIOSurface::IsGpuMemoryBufferConfigurationSupported(
     gfx::BufferFormat format,
     gfx::BufferUsage usage) {
   switch (usage) {
     case gfx::BufferUsage::GPU_READ:
-    case gfx::BufferUsage::GPU_READ_WRITE:
+    case gfx::BufferUsage::SCANOUT:
       return format == gfx::BufferFormat::BGRA_8888 ||
              format == gfx::BufferFormat::RGBA_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();
@@ skipping 123 matching lines @@
 
   scoped_refptr<gl::GLImageIOSurface> image(
       new gl::GLImageIOSurface(size, internalformat));
   if (!image->Initialize(it->second.get(), handle.id, format))
     return scoped_refptr<gl::GLImage>();
 
   return image;
 }
 
 }  // namespace content