Clean up SkImageFilter constructors.

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 "SkReadBuffer.h"
 #include "SkWriteBuffer.h"
@@ skipping 143 matching lines @@
     return false;
 }
 
 } // end namespace
 
 ///////////////////////////////////////////////////////////////////////////////
 
 SkDisplacementMapEffect::SkDisplacementMapEffect(ChannelSelectorType xChannelSelector,
                                                  ChannelSelectorType yChannelSelector,
                                                  SkScalar scale,
-                                                 SkImageFilter* displacement,
-                                                 SkImageFilter* color,
+                                                 SkImageFilter* inputs[2],
                                                  const CropRect* cropRect)
-  : INHERITED(displacement, color, cropRect)
+  : INHERITED(2, inputs, cropRect)
   , fXChannelSelector(xChannelSelector)
   , fYChannelSelector(yChannelSelector)
   , fScale(scale)
 {
 }
 
 SkDisplacementMapEffect::~SkDisplacementMapEffect() {
 }
 
 SkDisplacementMapEffect::SkDisplacementMapEffect(SkReadBuffer& buffer)
@@ skipping 427 matching lines @@
                                                         const GrGLCaps&) {
     const GrDisplacementMapEffect& displacementMap =
         drawEffect.castEffect<GrDisplacementMapEffect>();
 
     EffectKey xKey = displacementMap.xChannelSelector();
     EffectKey yKey = displacementMap.yChannelSelector() << kChannelSelectorKeyBits;
 
     return xKey | yKey;
 }
 #endif