Make skpaint->grpaint flow work for composing draws

src/image/SkImageShader.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBitmapProcShader.h"
 #include "SkBitmapProvider.h"
 #include "SkImage_Base.h"
@@ skipping 120 matching lines @@
     SkAutoTUnref<GrFragmentProcessor> inner;
     if (doBicubic) {
         inner.reset(GrBicubicEffect::Create(mgr, texture, matrix, tm));
     } else {
         inner.reset(GrSimpleTextureEffect::Create(mgr, texture, matrix, params));
     }
 
     if (GrPixelConfigIsAlphaOnly(texture->config())) {
         return SkRef(inner.get());
     }
-    return GrFragmentProcessor::MulOuputByInputAlpha(inner);
+    return GrFragmentProcessor::MulOutputByInputAlpha(inner);
 }
 
 #endif