Extract gpu line dashing to GrDashLinePathRenderer

src/gpu/GrStrokeInfo.cpp

+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "GrStrokeInfo.h"
+
+#include "SkDashPathPriv.h"
+
+bool GrStrokeInfo::applyDash(SkPath* dst, GrStrokeInfo* dstStrokeInfo, const SkPath& src) const {
+    if (this->isDashed()) {
+        const SkPathEffect::DashInfo& info = this->getDashInfo();
+        SkStrokeRec strokeRec = fStroke;
+        if (SkDashPath::FilterDashPath(dst, src, &strokeRec, NULL, info)) {
+            dstStrokeInfo->fStroke = strokeRec;
+            dstStrokeInfo->removeDash();
+            return true;
+        }
+    }
+    return false;
+}