Add drawRegion() API to SkCanvas

include/core/SkCanvas.h

Index: include/core/SkCanvas.h
diff --git a/include/core/SkCanvas.h b/include/core/SkCanvas.h
index 1e0301179a53d7f71d73a0372ee2cca7725ea667..0409057cab13828945543a8e1e0843e5744f4a0b 100644
--- a/include/core/SkCanvas.h
+++ b/include/core/SkCanvas.h
@@ -702,6 +702,14 @@ public:
     void drawRectCoords(SkScalar left, SkScalar top, SkScalar right,
                         SkScalar bottom, const SkPaint& paint);
 
+    /** Draw the outline of the specified region using the specified paint.
+        @param region   The region to be drawn
+        @param paint    The paint used to draw the region
+    */
+    void drawRegion(const SkRegion& region, const SkPaint& paint) {

[reed1, 2016/08/26 12:27:02]

tiny nit: most of these non-virtuals we also put in the cpp. We should think
about detecting empty and just-a-rect at this level, before we dispatch to the
virtuals.

[msarett, 2016/08/26 13:20:14]

SGTM, see https://codereview.chromium.org/2286693002/

+        this->onDrawRegion(region, paint);
+    }
+
     /** Draw the specified oval using the specified paint. The oval will be
         filled or framed based on the Style in the paint.
         @param oval     The rectangle bounds of the oval to be drawn
@@ -1389,6 +1397,7 @@ protected:
 
     virtual void onDrawPaint(const SkPaint&);
     virtual void onDrawRect(const SkRect&, const SkPaint&);
+    virtual void onDrawRegion(const SkRegion& region, const SkPaint& paint);
     virtual void onDrawOval(const SkRect&, const SkPaint&);
     virtual void onDrawArc(const SkRect&, SkScalar startAngle, SkScalar sweepAngle, bool useCenter,
                            const SkPaint&);