Make GrPaint have a variable sized array of color and coverage stages rather than a fixed size.

src/effects/SkMorphologyImageFilter.cpp

Index: src/effects/SkMorphologyImageFilter.cpp
diff --git a/src/effects/SkMorphologyImageFilter.cpp b/src/effects/SkMorphologyImageFilter.cpp
index cb17c9011b6e9b98b8e7a807580983812e22e9ff..4783abdce9380633361a466f0520c246c1c17629 100644
--- a/src/effects/SkMorphologyImageFilter.cpp
+++ b/src/effects/SkMorphologyImageFilter.cpp
@@ -452,10 +452,10 @@ void apply_morphology_pass(GrContext* context,
                            GrMorphologyEffect::MorphologyType morphType,
                            Gr1DKernelEffect::Direction direction) {
     GrPaint paint;
-    paint.colorStage(0)->setEffect(GrMorphologyEffect::Create(texture,
-                                                              direction,
-                                                              radius,
-                                                              morphType))->unref();
+    paint.addColorEffect(GrMorphologyEffect::Create(texture,
+                                                    direction,
+                                                    radius,
+                                                    morphType))->unref();
     context->drawRect(paint, SkRect::MakeFromIRect(rect));
 }