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

src/effects/SkDisplacementMapEffect.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkDisplacementMapEffect.h"
 #include "SkFlattenableBuffers.h"
 #include "SkUnPreMultiply.h"
@@ skipping 287 matching lines @@
     desc.fWidth = src.width();
     desc.fHeight = src.height();
     desc.fConfig = kSkia8888_GrPixelConfig;
 
     GrAutoScratchTexture ast(context, desc);
     SkAutoTUnref<GrTexture> dst(ast.detach());
 
     GrContext::AutoRenderTarget art(context, dst->asRenderTarget());
 
     GrPaint paint;
-    paint.colorStage(0)->setEffect(
+    paint.addColorEffect(
         GrDisplacementMapEffect::Create(fXChannelSelector,
                                         fYChannelSelector,
                                         fScale,
                                         displacement,
                                         color))->unref();
     SkRect srcRect;
     src.getBounds(&srcRect);
     SkRect dstRect = srcRect;
     dstRect.offset(SkIntToScalar(colorOffset.fX), SkIntToScalar(colorOffset.fY));
     context->drawRectToRect(paint, srcRect, dstRect);
@@ skipping 213 matching lines @@
                                                   colorTex);
 
     colorKey <<= GrGLEffectMatrix::kKeyBits;
     EffectKey xKey = displacementMap.xChannelSelector() << (2 * GrGLEffectMatrix::kKeyBits);
     EffectKey yKey = displacementMap.yChannelSelector() << (2 * GrGLEffectMatrix::kKeyBits +
                                                             SkDisplacementMapEffect::kKeyBits);
 
     return xKey | yKey | displKey | colorKey;
 }
 #endif