Optimize CSS box-shadow performance

src/effects/SkEmbossMaskFilter.cpp

 /*
  * Copyright 2006 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 "SkEmbossMaskFilter.h"
 #include "SkBlurMaskFilter.h"
 #include "SkBlurMask.h"
@@ skipping 57 matching lines @@
 SkEmbossMaskFilter::SkEmbossMaskFilter(SkScalar blurSigma, const Light& light)
     : fLight(light), fBlurSigma(blurSigma) {
     normalize(fLight.fDirection);
 }
 
 SkMask::Format SkEmbossMaskFilter::getFormat() const {
     return SkMask::k3D_Format;
 }
 
 bool SkEmbossMaskFilter::filterMask(SkMask* dst, const SkMask& src,
-                                    const SkMatrix& matrix, SkIPoint* margin) const {
+                                    const SkMatrix& matrix, SkIPoint* margin, SkCachedData** data) const {
     SkScalar sigma = matrix.mapRadius(fBlurSigma);
 
-    if (!SkBlurMask::BoxBlur(dst, src, sigma, kInner_SkBlurStyle, kLow_SkBlurQuality)) {
+    if (!SkBlurMask::BoxBlur(dst, NULL, src, sigma, kInner_SkBlurStyle, kLow_SkBlurQuality)) {
         return false;
     }
 
     dst->fFormat = SkMask::k3D_Format;
     if (margin) {
         margin->set(SkScalarCeilToInt(3*sigma), SkScalarCeilToInt(3*sigma));
     }
 
     if (src.fImage == NULL) {
         return true;
@@ skipping 71 matching lines @@
     str->append(") ");
 
     str->appendf("ambient: %d specular: %d ",
         fLight.fAmbient, fLight.fSpecular);
 
     str->append("blurSigma: ");
     str->appendScalar(fBlurSigma);
     str->append(")");
 }
 #endif