Add override to force bitmap rendering

src/gpu/GrSWMaskHelper.h

Index: src/gpu/GrSWMaskHelper.h
diff --git a/src/gpu/GrSWMaskHelper.h b/src/gpu/GrSWMaskHelper.h
index ccd2df865e420038d056af10d254c5cfabdf4902..f8cce8b27717f3d0af5163ff67b23873f5742c84 100644
--- a/src/gpu/GrSWMaskHelper.h
+++ b/src/gpu/GrSWMaskHelper.h
@@ -49,8 +49,9 @@ public:
     // set up the internal state in preparation for draws. Since many masks
     // may be accumulated in the helper during creation, "resultBounds"
     // allows the caller to specify the region of interest - to limit the
-    // amount of work.
-    bool init(const SkIRect& resultBounds, const SkMatrix* matrix);
+    // amount of work. allowCompression should be set to false if you plan on using
+    // your own texture to draw into, and not a scratch texture via getTexture().
+    bool init(const SkIRect& resultBounds, const SkMatrix* matrix, bool allowCompression = true);
 
     // Draw a single rect into the accumulation bitmap using the specified op
     void draw(const SkRect& rect, SkRegion::Op op,