gpu: Add a private getter for opt flags

We want to show these flags in the inspector, so make them
available.

gsk/gpu/gskgpurenderer.c

@@ -487,3 +487,11 @@ gsk_gpu_renderer_get_scale (GskGpuRenderer *self)
 {
   return GSK_GPU_RENDERER_GET_CLASS (self)->get_scale (self);
 }
+
+GskGpuOptimizations
+gsk_gpu_renderer_get_optimizations (GskGpuRenderer *self)
+{
+  GskGpuRendererPrivate *priv = gsk_gpu_renderer_get_instance_private (self);
+
+  return priv->optimizations;
+}

gsk/gpu/gskgpurendererprivate.h

@@ -46,6 +46,7 @@ struct _GskGpuRendererClass
 GdkDrawContext *        gsk_gpu_renderer_get_context                    (GskGpuRenderer         *self);
 GskGpuDevice *          gsk_gpu_renderer_get_device                     (GskGpuRenderer         *self);
 double                  gsk_gpu_renderer_get_scale                      (GskGpuRenderer         *self);
+GskGpuOptimizations     gsk_gpu_renderer_get_optimizations              (GskGpuRenderer         *self);
 
 G_END_DECLS