Add R_8 GPU memory buffers format.

ui/ozone/gpu/gpu_memory_buffer_factory_ozone_native_buffer.cc

Index: ui/ozone/gpu/gpu_memory_buffer_factory_ozone_native_buffer.cc
diff --git a/ui/ozone/gpu/gpu_memory_buffer_factory_ozone_native_buffer.cc b/ui/ozone/gpu/gpu_memory_buffer_factory_ozone_native_buffer.cc
index 38667e51e180f2d306fc50ec87e8994da9d88e1f..15ef312faf6cb05cdb36c794f1c752b9978f36e4 100644
--- a/ui/ozone/gpu/gpu_memory_buffer_factory_ozone_native_buffer.cc
+++ b/ui/ozone/gpu/gpu_memory_buffer_factory_ozone_native_buffer.cc
@@ -4,6 +4,8 @@
 
 #include "ui/ozone/gpu/gpu_memory_buffer_factory_ozone_native_buffer.h"
 
+#include <utility>
+
 #include "base/logging.h"
 #include "ui/gl/gl_image_egl.h"
 #include "ui/gl/gl_image_linux_dma_buffer.h"
@@ -95,6 +97,7 @@ SurfaceFactoryOzone::BufferFormat GetOzoneFormatFor(
     case gfx::GpuMemoryBuffer::DXT1:
     case gfx::GpuMemoryBuffer::DXT5:
     case gfx::GpuMemoryBuffer::ETC1:
+    case gfx::GpuMemoryBuffer::R_8:
     case gfx::GpuMemoryBuffer::BGRA_8888:
       NOTREACHED();
       return SurfaceFactoryOzone::RGBA_8888;