Optimize CSS box-shadow performance

gm/blurrect.cpp

 /*
 * Copyright 2012 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
 
 #include "gm.h"
 #include "SkBlurMask.h"
 #include "SkBlurMaskFilter.h"
@@ skipping 173 matching lines @@
             SkAutoCanvasRestore autoRestore(canvas, true);
 
             for (size_t j = 0 ; j < SK_ARRAY_COUNT(radii) ; j++) {
                 float radius = radii[j];
                 for (size_t k = 0 ; k < SK_ARRAY_COUNT(styles) ; k++) {
                     SkBlurStyle style = styles[k];
 
                     SkMask mask;
                     SkBlurMask::BlurRect(SkBlurMask::ConvertRadiusToSigma(radius), &mask, r, style);
 
-                    SkAutoMaskFreeImage amfi(mask.fImage);
-
                     SkBitmap bm;
                     bm.installMaskPixels(mask);
 
                     if (cur_x + bm.width() >= fGMWidth - fMargin) {
                         cur_x = 0;
                         cur_y += max_height + fPadding;
                         max_height = 0;
                     }
 
                     canvas->save();
@@ skipping 179 matching lines @@
     }
 private:
     typedef BlurRectCompareGM INHERITED;
 };
 
 
 //////////////////////////////////////////////////////////////////////////////
 
 DEF_GM(return new BlurRectGM("blurrects", 0xFF);)
 DEF_GM(return new BlurRectDirectGM("blurrect_gallery");)