ozone: Create GbmBuffers from fourcc formats and gbm flags.

ui/ozone/platform/drm/gpu/drm_overlay_validator.cc

Index: ui/ozone/platform/drm/gpu/drm_overlay_validator.cc
diff --git a/ui/ozone/platform/drm/gpu/drm_overlay_validator.cc b/ui/ozone/platform/drm/gpu/drm_overlay_validator.cc
index 9fb93b9e2424181dd7b78c4f95b842ed42aff781..34c62c17e52a87f8c8c5eb6c74d877c7f5737db9 100644
--- a/ui/ozone/platform/drm/gpu/drm_overlay_validator.cc
+++ b/ui/ozone/platform/drm/gpu/drm_overlay_validator.cc
@@ -43,9 +43,8 @@ scoped_refptr<ScanoutBuffer> GetBufferForPageFlipTest(
     }
   }
 
-  gfx::BufferFormat buffer_format = GetBufferFormatFromFourCCFormat(format);
   scoped_refptr<ScanoutBuffer> scanout_buffer =
-      buffer_generator->Create(drm_device, buffer_format, size);
+      buffer_generator->Create(drm_device, format, size);
   reusable_buffers->push_back(scanout_buffer);
 
   return scanout_buffer;