Wire up invalidation for flood-{color,opacity} on <feDropShadow>

third_party/WebKit/Source/platform/graphics/filters/FEDropShadow.h

Index: third_party/WebKit/Source/platform/graphics/filters/FEDropShadow.h
diff --git a/third_party/WebKit/Source/platform/graphics/filters/FEDropShadow.h b/third_party/WebKit/Source/platform/graphics/filters/FEDropShadow.h
index 84fd98a67c18b8ad0386dde7d67eef07d4cf97a2..93eaf375563ba2c7a6dfab97c6d081a1e4c04aad 100644
--- a/third_party/WebKit/Source/platform/graphics/filters/FEDropShadow.h
+++ b/third_party/WebKit/Source/platform/graphics/filters/FEDropShadow.h
@@ -32,6 +32,9 @@ public:
 
     FloatRect mapRect(const FloatRect&, bool forward = true) const final;
 
+    void setShadowColor(const Color& color) { m_shadowColor = color; }
+    void setShadowOpacity(float opacity) { m_shadowOpacity = opacity; }
+
     TextStream& externalRepresentation(TextStream&, int indention) const override;
     sk_sp<SkImageFilter> createImageFilter() override;