Allow Core Animation compositor to use some scaled filter effects.

cc/output/ca_layer_overlay.cc

Index: cc/output/ca_layer_overlay.cc
diff --git a/cc/output/ca_layer_overlay.cc b/cc/output/ca_layer_overlay.cc
index 8117a682d844534237aba51151e47a6930fb0d63..0fc1253662226857c4268e87ca0edf511659212b 100644
--- a/cc/output/ca_layer_overlay.cc
+++ b/cc/output/ca_layer_overlay.cc
@@ -103,8 +103,6 @@ bool ConvertAndAppendFilterOperation(
 CALayerResult FromRenderPassQuad(ResourceProvider* resource_provider,
                                  const RenderPassDrawQuad* quad,
                                  CALayerOverlay* ca_layer_overlay) {
-  if (quad->filters_scale != gfx::Vector2dF(1, 1))
-    return CA_LAYER_FAILED_RENDER_PASS_FILTER_SCALE;
   if (quad->background_filters.size() != 0)
     return CA_LAYER_FAILED_RENDER_PASS_BACKGROUND_FILTERS;
   if (quad->mask_resource_id() != 0)
@@ -117,6 +115,17 @@ CALayerResult FromRenderPassQuad(ResourceProvider* resource_provider,
       return CA_LAYER_FAILED_RENDER_PASS_FILTER_OPERATION;
   }
 
+  if (quad->filters_scale != gfx::Vector2dF(1, 1)) {
+    for (const ui::CARendererLayerParams::FilterEffect& effect :
+         ca_layer_overlay->filter_effects) {
+      using FilterEffectType = ui::CARendererLayerParams::FilterEffectType;
+      if (effect.type == FilterEffectType::BLUR ||
+          effect.type == FilterEffectType::DROP_SHADOW) {
+        return CA_LAYER_FAILED_RENDER_PASS_FILTER_SCALE;
+      }
+    }
+  }
+
   ca_layer_overlay->render_pass_id = quad->render_pass_id;
   ca_layer_overlay->contents_rect = gfx::RectF(0, 0, 1, 1);