Plumb drawArc to SkDevice

include/core/SkDevice.h

 /*
  * Copyright 2010 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.
  */
 
 #ifndef SkDevice_DEFINED
 #define SkDevice_DEFINED
 
@@ skipping 143 matching lines @@
      and are handling any looping from the paint, and any effects from the
      DrawFilter.
      */
     virtual void drawPaint(const SkDraw&, const SkPaint& paint) = 0;
     virtual void drawPoints(const SkDraw&, SkCanvas::PointMode mode, size_t count,
                             const SkPoint[], const SkPaint& paint) = 0;
     virtual void drawRect(const SkDraw&, const SkRect& r,
                           const SkPaint& paint) = 0;
     virtual void drawOval(const SkDraw&, const SkRect& oval,
                           const SkPaint& paint) = 0;
+    virtual void drawArc(const SkDraw&, const SkRect& oval, SkScalar startAngle,
+                         SkScalar sweepAngle, bool useCenter, const SkPaint& paint);
     virtual void drawRRect(const SkDraw&, const SkRRect& rr,
                            const SkPaint& paint) = 0;
 
     // Default impl calls drawPath()
     virtual void drawDRRect(const SkDraw&, const SkRRect& outer,
                             const SkRRect& inner, const SkPaint&);
 
     /**
      *  If pathIsMutable, then the implementation is allowed to cast path to a
      *  non-const pointer and modify it in place (as an optimization). Canvas
@@ skipping 199 matching lines @@
     SkSurfaceProps fSurfaceProps;
 
 #ifdef SK_SUPPORT_LEGACY_ACCESSBITMAP
     SkBitmap    fLegacyBitmap;
 #endif
 
     typedef SkRefCnt INHERITED;
 };
 
 #endif