Optimize CSS box-shadow performance

src/core/SkBitmap.cpp

Index: src/core/SkBitmap.cpp
diff --git a/src/core/SkBitmap.cpp b/src/core/SkBitmap.cpp
index f0ad029bea9285b74f03bbb0700ad09d1255c797..5927ba948d1c0bfc8a8ea2b75082facbb444009b 100644
--- a/src/core/SkBitmap.cpp
+++ b/src/core/SkBitmap.cpp
@@ -1106,7 +1106,7 @@ bool SkBitmap::extractAlpha(SkBitmap* dst, const SkPaint* paint,
     if (filter) {
         identity.reset();
         srcM.fImage = NULL;
-        if (!filter->filterMask(&dstM, srcM, identity, NULL)) {
+        if (!filter->filterMask(&dstM, srcM, identity, NULL, NULL)) {
             goto NO_FILTER_CASE;
         }
         dstM.fRowBytes = SkAlign4(dstM.fBounds.width());
@@ -1130,7 +1130,7 @@ bool SkBitmap::extractAlpha(SkBitmap* dst, const SkPaint* paint,
     SkAutoMaskFreeImage srcCleanup(srcM.fImage);
 
     GetBitmapAlpha(*this, srcM.fImage, srcM.fRowBytes);
-    if (!filter->filterMask(&dstM, srcM, identity, NULL)) {
+    if (!filter->filterMask(&dstM, srcM, identity, NULL, NULL)) {
         goto NO_FILTER_CASE;
     }
     SkAutoMaskFreeImage dstCleanup(dstM.fImage);