Set temporary paths volatile so we don't cache them.

src/core/SkDraw.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 "SkDraw.h"
 #include "SkBlitter.h"
 #include "SkCanvas.h"
@@ skipping 993 matching lines @@
     // nothing to draw
     if (fRC->isEmpty()) {
         return;
     }
 
     SkPath*         pathPtr = (SkPath*)&origSrcPath;
     bool            doFill = true;
     SkPath          tmpPath;
     SkMatrix        tmpMatrix;
     const SkMatrix* matrix = fMatrix;
+    tmpPath.setIsVolatile(true);
 
     if (prePathMatrix) {
         if (origPaint.getPathEffect() || origPaint.getStyle() != SkPaint::kFill_Style ||
                 origPaint.getRasterizer()) {
             SkPath* result = pathPtr;
 
             if (!pathIsMutable) {
                 result = &tmpPath;
                 pathIsMutable = true;
             }
@@ skipping 1352 matching lines @@
         mask->fImage = SkMask::AllocImage(size);
         memset(mask->fImage, 0, mask->computeImageSize());
     }
 
     if (SkMask::kJustComputeBounds_CreateMode != mode) {
         draw_into_mask(*mask, devPath, style);
     }
 
     return true;
 }