Add the ability for gpu to render dotted lines (dashed line, 0 on interval, round caps)

src/gpu/effects/GrDashingEffect.h

 
 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrDashingEffect_DEFINED
 #define GrDashingEffect_DEFINED
 
 #include "GrTypesPriv.h"
 #include "SkPathEffect.h"
 
 class GrGpu;
 class GrDrawTarget;
 class GrPaint;
 class GrStrokeInfo;
 
 class GrGLDashingEffect;
 class SkPath;
 
 namespace GrDashingEffect {
     bool DrawDashLine(const SkPoint pts[2], const GrPaint& paint, const GrStrokeInfo& strokeInfo,
                       GrGpu* gpu, GrDrawTarget* target, const SkMatrix& vm);
 
+    enum DashCap {
+        kRound_DashCap,
+        kNonRound_DashCap,
+    };
+
     /**
      * An effect that renders a dashed line. It is intended to be used as a coverage effect.
      * The effect is meant for dashed lines that only have a single on/off interval pair.
      * Bounding geometry is rendered and the effect computes coverage based on the fragment's
      * position relative to the dashed line.
      */
     GrEffectRef* Create(GrEffectEdgeType edgeType, const SkPathEffect::DashInfo& info,
-                        SkScalar strokeWidth);
+                        SkScalar strokeWidth, DashCap cap);
 }
 
 #endif