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

gpu/command_buffer/service/in_process_command_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 "gpu/command_buffer/service/in_process_command_buffer.h"
 
 #include <queue>
 #include <set>
 #include <utility>
 
@@ skipping 751 matching lines @@
     size_t height,
     unsigned internalformat,
     unsigned usage) {
   CheckSequencedThread();
 
   DCHECK(gpu_memory_buffer_manager_);
   scoped_ptr<gfx::GpuMemoryBuffer> buffer(
       gpu_memory_buffer_manager_->AllocateGpuMemoryBuffer(
           gfx::Size(width, height),
           gpu::ImageFactory::DefaultBufferFormatForImageFormat(internalformat),
-          gfx::BufferUsage::GPU_READ_WRITE));
+          gfx::BufferUsage::SCANOUT));
   if (!buffer)
     return -1;
 
   return CreateImage(buffer->AsClientBuffer(), width, height, internalformat);
 }
 
 uint32 InProcessCommandBuffer::InsertSyncPoint() {
   uint32 sync_point = service_->sync_point_manager()->GenerateSyncPoint();
   QueueTask(base::Bind(&InProcessCommandBuffer::RetireSyncPointOnGpuThread,
                        base::Unretained(this),
@@ skipping 300 matching lines @@
     framebuffer_completeness_cache_ =
         new gpu::gles2::FramebufferCompletenessCache;
   return framebuffer_completeness_cache_;
 }
 
 SyncPointManager* GpuInProcessThread::sync_point_manager() {
   return sync_point_manager_;
 }
 
 }  // namespace gpu