Use vertex attributes for dash effect in gpu

src/gpu/SkGpuDevice.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkGpuDevice.h"
 
 #include "effects/GrBicubicEffect.h"
@@ skipping 368 matching lines @@
                              size_t count, const SkPoint pts[], const SkPaint& paint) {
     CHECK_FOR_ANNOTATION(paint);
     CHECK_SHOULD_DRAW(draw, false);
 
     SkScalar width = paint.getStrokeWidth();
     if (width < 0) {
         return;
     }
 
     if (paint.getPathEffect() && 2 == count && SkCanvas::kLines_PointMode == mode) {
-        if (GrDashingEffect::DrawDashLine(pts, paint, this->context())) {
-            return;
-        }
+        GrStrokeInfo strokeInfo(paint, SkPaint::kStroke_Style);
+        GrPaint grPaint;
+        SkPaint2GrPaintShader(this->context(), paint, true, &grPaint);
+        SkPath path;
+        path.moveTo(pts[0]);
+        path.lineTo(pts[1]);
+        fContext->drawPath(grPaint, path, strokeInfo);
+        return;
     }
 
     // we only handle hairlines and paints without path effects or mask filters,
     // else we let the SkDraw call our drawPath()
     if (width > 0 || paint.getPathEffect() || paint.getMaskFilter()) {
         draw.drawPoints(mode, count, pts, paint, true);
         return;
     }
 
     GrPaint grPaint;
@@ skipping 1595 matching lines @@
         GrCachedLayer* layer = fContext->getLayerCache()->findLayerOrCreate(picture, i);
 
         if (NULL != layer->getTexture()) {
             fContext->unlockScratchTexture(layer->getTexture());
             layer->setTexture(NULL);
         }
     }
 
     return true;
 }