Ozone GBM: support R_8 format to GpuMemoryBuffers

ui/ozone/platform/drm/client_native_pixmap_factory_gbm.cc

 // Copyright 2015 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 "ui/ozone/platform/drm/client_native_pixmap_factory_gbm.h"
 
 #include <utility>
 
 #include "base/macros.h"
 #include "ui/gfx/native_pixmap_handle_ozone.h"
@@ skipping 30 matching lines @@
     switch (usage) {
       case gfx::BufferUsage::GPU_READ:
       case gfx::BufferUsage::SCANOUT:
         return format == gfx::BufferFormat::RGBA_8888 ||
                format == gfx::BufferFormat::RGBX_8888 ||
                format == gfx::BufferFormat::BGRA_8888 ||
                format == gfx::BufferFormat::BGRX_8888;
       case gfx::BufferUsage::GPU_READ_CPU_READ_WRITE:
       case gfx::BufferUsage::GPU_READ_CPU_READ_WRITE_PERSISTENT: {
 #if defined(OS_CHROMEOS)
-        return format == gfx::BufferFormat::BGRA_8888;
+        return format == gfx::BufferFormat::R_8 ||
+               format == gfx::BufferFormat::BGRA_8888;
 #else
         return false;
 #endif
       }
     }
     NOTREACHED();
     return false;
   }
   scoped_ptr<ClientNativePixmap> ImportFromHandle(
       const gfx::NativePixmapHandle& handle,
@@ skipping 21 matching lines @@
   }
 
   DISALLOW_COPY_AND_ASSIGN(ClientNativePixmapFactoryGbm);
 };
 
 ClientNativePixmapFactory* CreateClientNativePixmapFactoryGbm() {
   return new ClientNativePixmapFactoryGbm();
 }
 
 }  // namespace ui