ui: Add gfx::BufferUsage::SCANOUT_CPU_READ_WRITE.

gpu/ipc/host/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/host/gpu_memory_buffer_support.h"
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "build/build_config.h"
 #include "gpu/ipc/common/gpu_memory_buffer_support.h"
@@ skipping 52 matching lines @@
   bool force_native_gpu_read_write_formats =
       base::CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
           switches::kUseGL) !=
       gl::GetGLImplementationName(gl::GetSoftwareGLImplementation());
   if (force_native_gpu_read_write_formats) {
     const gfx::BufferFormat kGPUReadWriteFormats[] = {
         gfx::BufferFormat::BGR_565,   gfx::BufferFormat::RGBA_8888,
         gfx::BufferFormat::RGBX_8888, gfx::BufferFormat::BGRA_8888,
         gfx::BufferFormat::BGRX_8888, gfx::BufferFormat::UYVY_422,
         gfx::BufferFormat::YVU_420,   gfx::BufferFormat::YUV_420_BIPLANAR};
-    const gfx::BufferUsage kGPUReadWriteUsages[] = {gfx::BufferUsage::GPU_READ,
-                                                    gfx::BufferUsage::SCANOUT};
+    const gfx::BufferUsage kGPUReadWriteUsages[] = {
+        gfx::BufferUsage::GPU_READ, gfx::BufferUsage::SCANOUT,
+        gfx::BufferUsage::SCANOUT_CPU_READ_WRITE};
     for (auto format : kGPUReadWriteFormats) {
       for (auto usage : kGPUReadWriteUsages) {
         if (IsNativeGpuMemoryBufferConfigurationSupported(format, usage))
           configurations.insert(std::make_pair(format, usage));
       }
     }
   }
 #endif  // defined(USE_OZONE) || defined(OS_MACOSX)
 
   return configurations;
@@ skipping 22 matching lines @@
       break;
   }
   NOTREACHED();
   return GL_TEXTURE_2D;
 #else  // defined(USE_OZONE) || defined(OS_MACOSX)
   return GL_TEXTURE_2D;
 #endif
 }
 
 }  // namespace gpu