ozone: Consolidate primary plane format.

ui/display/types/display_snapshot.h

Index: ui/display/types/display_snapshot.h
diff --git a/ui/display/types/display_snapshot.h b/ui/display/types/display_snapshot.h
index a4654e2f750b07f529624935e8c1c24c3633dbe5..58cdb398b2a41a55213b634493b42ee7ca4ec28e 100644
--- a/ui/display/types/display_snapshot.h
+++ b/ui/display/types/display_snapshot.h
@@ -13,6 +13,7 @@
 #include "base/macros.h"
 #include "ui/display/types/display_constants.h"
 #include "ui/display/types/display_mode.h"
+#include "ui/gfx/buffer_types.h"
 #include "ui/gfx/geometry/point.h"
 #include "ui/gfx/geometry/size.h"
 
@@ -77,6 +78,9 @@ class DISPLAY_TYPES_EXPORT DisplaySnapshot {
   // Used when no product id known.
   static const int64_t kInvalidProductID = -1;
 
+  // Return the buffer format to be used for the primary plane buffer.
+  static gfx::BufferFormat PrimaryFormat();
+
  protected:
   // Display id for this output.
   int64_t display_id_;