Implement filter effects in Core Animation using CAFilters.

ui/gl/ca_renderer_layer_params.cc

Index: ui/gl/ca_renderer_layer_params.cc
diff --git a/ui/gl/ca_renderer_layer_params.cc b/ui/gl/ca_renderer_layer_params.cc
index 8a4d745cf629675ec5695759e785062d5c26f1cc..952e703afb47551a78cf5272ef8e5ad96c063124 100644
--- a/ui/gl/ca_renderer_layer_params.cc
+++ b/ui/gl/ca_renderer_layer_params.cc
@@ -33,4 +33,11 @@ CARendererLayerParams::CARendererLayerParams(
     const CARendererLayerParams& other) = default;
 CARendererLayerParams::~CARendererLayerParams() = default;
 
+bool CARendererLayerParams::FilterEffect::operator==(
+    const FilterEffect& rhs) const {
+  return type == rhs.type && amount == rhs.amount &&
+         drop_shadow_offset == rhs.drop_shadow_offset &&
+         drop_shadow_color == rhs.drop_shadow_color;
+}
+
 }  // namespace ui