Add dash lines batch unit test

src/gpu/GrStrokeInfo.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 GrStrokeInfo_DEFINED
 #define GrStrokeInfo_DEFINED
 
@@ skipping 20 matching lines @@
         } else {
             fDashType = SkPathEffect::kNone_DashType;
         }
     }
 
     GrStrokeInfo(const SkPaint& paint, SkPaint::Style styleOverride) :
         fStroke(paint, styleOverride), fDashType(SkPathEffect::kNone_DashType) {
         this->init(paint);
     }
 
-
     explicit GrStrokeInfo(const SkPaint& paint) :
         fStroke(paint), fDashType(SkPathEffect::kNone_DashType) {
         this->init(paint);
     }
 
     GrStrokeInfo& operator=(const GrStrokeInfo& other) {
         fStroke = other.fStroke;
         fDashInfo = other.fDashInfo;
         fDashType = other.fDashType;
         fIntervals.reset(other.dashCount());
@@ skipping 19 matching lines @@
             if (SkPathEffect::kDash_DashType == fDashType) {
                 fIntervals.reset(fDashInfo.fCount);
                 fDashInfo.fIntervals = fIntervals.get();
                 pe->asADash(&fDashInfo);
                 return true;
             }
         }
         return false;
     }
 
+    /*
+     * Like the above, but sets with an explicit SkPathEffect::DashInfo
+     */
+    bool setDashInfo(const SkPathEffect::DashInfo& info) {
+        if (!fStroke.isFillStyle()) {
+            SkASSERT(!fStroke.isFillStyle());
+            fDashInfo.fCount = info.fCount;
+            fDashInfo.fPhase = info.fPhase;
+            fIntervals.reset(info.fCount);
+            for (int i = 0; i < info.fCount; i++) {
+                fIntervals[i] = info.fIntervals[i];
+            }
+            fDashInfo.fIntervals = fIntervals.get();
+            return true;
+        }
+        return false;
+    }
+
     bool isDashed() const {
         return (!fStroke.isFillStyle() && SkPathEffect::kDash_DashType == fDashType);
     }
 
     bool isFillStyle() const { return fStroke.isFillStyle(); }
 
     int32_t dashCount() const {
         return fDashInfo.fCount;
     }
 
@@ skipping 18 matching lines @@
         this->setDashInfo(pe);
     }
 
     SkStrokeRec            fStroke;
     SkPathEffect::DashType fDashType;
     SkPathEffect::DashInfo fDashInfo;
     SkAutoSTArray<2, SkScalar> fIntervals;
 };
 
 #endif