speed up A8

src/core/SkDraw.cpp

Index: src/core/SkDraw.cpp
diff --git a/src/core/SkDraw.cpp b/src/core/SkDraw.cpp
index df73f7ae3795829c09e40349a8671d805dd19d6c..af4f1ca0474fdecee56f137092f606cf31317133 100644
--- a/src/core/SkDraw.cpp
+++ b/src/core/SkDraw.cpp
@@ -59,9 +59,9 @@ public:
         fBlitter = NULL;
     }
     SkAutoBlitterChoose(const SkBitmap& device, const SkMatrix& matrix,
-                        const SkPaint& paint) {
+                        const SkPaint& paint, bool drawCoverage = false) {
         fBlitter = SkBlitter::Choose(device, matrix, paint,
-                                     fStorage, sizeof(fStorage));
+                                     fStorage, sizeof(fStorage), drawCoverage);
     }
 
     ~SkAutoBlitterChoose();
@@ -1023,7 +1023,8 @@ bool SkDrawTreatAsHairline(const SkPaint& paint, const SkMatrix& matrix,
 }
 
 void SkDraw::drawPath(const SkPath& origSrcPath, const SkPaint& origPaint,
-                      const SkMatrix* prePathMatrix, bool pathIsMutable) const {
+                      const SkMatrix* prePathMatrix, bool pathIsMutable,
+                      bool drawCoverage) const {
     SkDEBUGCODE(this->validate();)
 
     // nothing to draw
@@ -1112,7 +1113,7 @@ void SkDraw::drawPath(const SkPath& origSrcPath, const SkPaint& origPaint,
     // transform the path into device space
     pathPtr->transform(*matrix, devPathPtr);
 
-    SkAutoBlitterChoose blitter(*fBitmap, *fMatrix, *paint);
+    SkAutoBlitterChoose blitter(*fBitmap, *fMatrix, *paint, drawCoverage);
 
     if (paint->getMaskFilter()) {
         SkPaint::Style style = doFill ? SkPaint::kFill_Style :