Implement SkiaCanvasProxy::onDrawArc

Test: UiRendering CTS SweepTests with picture mode turned on and
drawBitmapMesh turned off (it's not implemented yet).

This should fix BUG:34306056, and part of BUG:34871089 (the drawArc part
of SweepTests in picture mode).

BUG:34306056
BUG:34871089

Change-Id: I8fdcf72ddb4a0bfccedfd7e4e374a1ec5df17d75
(cherry picked from commit 538b6359cf81b14322141089161f20291295d6d3)
diff --git a/libs/hwui/SkiaCanvasProxy.h b/libs/hwui/SkiaCanvasProxy.h
index b3f6c07..3b1dd73 100644
--- a/libs/hwui/SkiaCanvasProxy.h
+++ b/libs/hwui/SkiaCanvasProxy.h
@@ -60,6 +60,8 @@
     virtual void onDrawRect(const SkRect&, const SkPaint&) override;
     virtual void onDrawRRect(const SkRRect&, const SkPaint&) override;
     virtual void onDrawPath(const SkPath& path, const SkPaint&) override;
+    virtual void onDrawArc(const SkRect&, SkScalar startAngle, SkScalar sweepAngle, bool useCenter,
+                           const SkPaint&) override;
     virtual void onDrawBitmap(const SkBitmap&, SkScalar left, SkScalar top,
                               const SkPaint*) override;
     virtual void onDrawBitmapRect(const SkBitmap&, const SkRect* src, const SkRect& dst,