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

src/core/SkImageFilter.cpp

 /*
  * Copyright 2012 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkImageFilter.h"
 
 #include "SkBitmap.h"
@@ skipping 109 matching lines @@
     GrAutoScratchTexture dst(context, desc);
     GrContext::AutoMatrix am;
     am.setIdentity(context);
     GrContext::AutoRenderTarget art(context, dst.texture()->asRenderTarget());
     GrContext::AutoClip acs(context, rect);
     GrEffectRef* effect;
     this->asNewEffect(&effect, srcTexture);
     SkASSERT(effect);
     SkAutoUnref effectRef(effect);
     GrPaint paint;
-    paint.colorStage(0)->setEffect(effect);
+    paint.addColorEffect(effect);
     context->drawRect(paint, rect);
     SkAutoTUnref<GrTexture> resultTex(dst.detach());
     SkImageFilterUtils::WrapTexture(resultTex, input.width(), input.height(), result);
     return true;
 #else
     return false;
 #endif
 }
 
 bool SkImageFilter::onFilterBounds(const SkIRect& src, const SkMatrix& ctm,
                                    SkIRect* dst) {
     *dst = src;
     return true;
 }
 
 bool SkImageFilter::asNewEffect(GrEffectRef**, GrTexture*) const {
     return false;
 }
 
 bool SkImageFilter::asColorFilter(SkColorFilter**) const {
     return false;
 }