Fix for GrAALinearizingConvexPathRenderer incorrectly drawing non-convex paths

tests/IsClosedSingleContourTest.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 "Test.h"
+#include "SkPathPriv.h"
+
+DEF_TEST(IsClosedSingleContourTest, reporter) {
+    SkPath p;
+    REPORTER_ASSERT(reporter, !SkPathPriv::IsClosedSingleContour(p));
+
+    p.reset();
+    p.close();
+    REPORTER_ASSERT(reporter, !SkPathPriv::IsClosedSingleContour(p));
+
+    p.reset();
+    p.moveTo(10, 10);
+    p.close();
+    REPORTER_ASSERT(reporter, SkPathPriv::IsClosedSingleContour(p));
+
+    p.reset();
+    p.moveTo(10, 10);
+    p.lineTo(20, 20);
+    p.close();
+    REPORTER_ASSERT(reporter, SkPathPriv::IsClosedSingleContour(p));
+
+    p.reset();
+    p.moveTo(10, 10);
+    p.lineTo(20, 20);
+    p.quadTo(30, 30, 40, 40);
+    p.cubicTo(50, 50, 60, 60, 70, 70);
+    p.conicTo(30, 30, 40, 40, 0.5);
+    p.close();
+    REPORTER_ASSERT(reporter, SkPathPriv::IsClosedSingleContour(p));
+
+    p.reset();
+    p.moveTo(10, 10);
+    p.lineTo(20, 20);
+    p.lineTo(20, 30);
+    REPORTER_ASSERT(reporter, !SkPathPriv::IsClosedSingleContour(p));
+
+    p.reset();
+    p.moveTo(10, 10);
+    p.lineTo(20, 20);
+    p.moveTo(10, 10);
+    p.lineTo(20, 30);
+    p.close();
+    REPORTER_ASSERT(reporter, !SkPathPriv::IsClosedSingleContour(p));
+
+    p.reset();
+    p.moveTo(10, 10);
+    p.lineTo(20, 20);
+    p.close();
+    p.lineTo(20, 30);
+    p.close();
+    REPORTER_ASSERT(reporter, !SkPathPriv::IsClosedSingleContour(p));
+}