gpu: support RG_88 GpuMemoryBuffer

ui/ozone/platform/drm/client_native_pixmap_factory_gbm.cc

Index: ui/ozone/platform/drm/client_native_pixmap_factory_gbm.cc
diff --git a/ui/ozone/platform/drm/client_native_pixmap_factory_gbm.cc b/ui/ozone/platform/drm/client_native_pixmap_factory_gbm.cc
index 06aada4e3175f1dc3659cf53de62dcef0b3a7211..6199e36f11a432930ad3987441a5b8425c805770 100644
--- a/ui/ozone/platform/drm/client_native_pixmap_factory_gbm.cc
+++ b/ui/ozone/platform/drm/client_native_pixmap_factory_gbm.cc
@@ -62,9 +62,10 @@ class ClientNativePixmapFactoryGbm : public ClientNativePixmapFactory {
 #if defined(OS_CHROMEOS)
         return
 #if defined(ARCH_CPU_X86_FAMILY)
-            // Currently only Intel driver (i.e. minigbm and Mesa) supports R_8.
-            // crbug.com/356871
+            // Currently only Intel driver (i.e. minigbm and Mesa) supports R_8
+            // and RG_88. crbug.com/356871
             format == gfx::BufferFormat::R_8 ||
+            format == gfx::BufferFormat::RG_88 ||
 #endif
             format == gfx::BufferFormat::BGRA_8888;
 #else