GdkRegion          11 ui/base/gtk/scoped_region.h typedef struct _GdkRegion GdkRegion;
GdkRegion          14 ui/gfx/gtk_util.h typedef struct _GdkRegion GdkRegion;
GdkRegion         105 ui/gfx/native_widget_types.h typedef struct _GdkRegion GdkRegion;