Add initial implementation of GrShape and GrStyle classes and tests

src/gpu/GrStyle.cpp

+/*
+ * Copyright 2016 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "GrStyle.h"
+
+void GrStyle::initPathEffect(SkPathEffect* pe) {
+    if (!pe) {
+        fDashInfo.fType = SkPathEffect::kNone_DashType;
+        return;
+    }
+    SkPathEffect::DashInfo info;
+    if (SkPathEffect::kDash_DashType == pe->asADash(&info)) {
+        if (fStrokeRec.getStyle() == SkStrokeRec::kFill_Style) {
+            fPathEffect.reset(nullptr);
+        } else {
+            fPathEffect.reset(SkSafeRef(pe));
+            fDashInfo.fType = SkPathEffect::kDash_DashType;
+            fDashInfo.fIntervals.reset(info.fCount);
+            fDashInfo.fPhase = info.fPhase;
+            info.fIntervals = fDashInfo.fIntervals.get();
+            pe->asADash(&info);
+            return;
+        }
+    } else {
+        fPathEffect.reset(SkSafeRef(pe));
+    }
+    fDashInfo.fType = SkPathEffect::kNone_DashType;
+    fDashInfo.fIntervals.reset(0);
+}