Add a test for crbug 613918 and fix a style issue.

tests/PathTest.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 <cmath>
 #include "SkCanvas.h"
 #include "SkGeometry.h"
@@ skipping 466 matching lines @@
         "L-0.340154098751264,-0.11341791238732665L-0.340162664924548,-0.1134378899559977"
         "L-0.34017979727111597,-0.11340126558629839L-0.3401655203156427,-0.11338129083212668"
         "L-0.34012268944922275,-0.11332137577529414L-0.34007414780061346,-0.11334467443478255Z"
         "M-0.3400027630232468,-0.11290567901106024L-0.3400113291965308,-0.11298876531245433"
         "L-0.33997991989448945,-0.11301535852306784L-0.33990282433493346,-0.11296217481488612"
         "L-0.33993994441916414,-0.11288906492739594Z";
     test_tiny_path_convexity(reporter, originalFiddleData, 22682.240000000005f,7819.72220766405f,
             65536);
 }
 
+static void test_crbug_613918() {
+    SkPath path;
+    path.conicTo(-6.62478e-08f, 4.13885e-08f, -6.36935e-08f, 3.97927e-08f, 0.729058f);
+    path.quadTo(2.28206e-09f, -1.42572e-09f, 3.91919e-09f, -2.44852e-09f);
+    path.cubicTo(-16752.2f, -26792.9f, -21.4673f, 10.9347f, -8.57322f, -7.22739f);
+
+    // This call could lead to an assert or uninitialized read due to a failure
+    // to check the return value from SkCubicClipper::ChopMonoAtY.
+    path.contains(-1.84817e-08f, 1.15465e-08f);
+}
+
 static void test_addrect(skiatest::Reporter* reporter) {
     SkPath path;
     path.lineTo(0, 0);
     path.addRect(SkRect::MakeWH(50, 100));
     REPORTER_ASSERT(reporter, path.isRect(nullptr));
 
     path.reset();
     path.lineTo(FLT_EPSILON, FLT_EPSILON);
     path.addRect(SkRect::MakeWH(50, 100));
     REPORTER_ASSERT(reporter, !path.isRect(nullptr));
@@ skipping 3675 matching lines @@
     test_islastcontourclosed(reporter);
     test_arb_round_rect_is_convex(reporter);
     test_arb_zero_rad_round_rect_is_rect(reporter);
     test_addrect(reporter);
     test_addrect_isfinite(reporter);
     test_tricky_cubic();
     test_clipped_cubic();
     test_crbug_170666();
     test_crbug_493450(reporter);
     test_crbug_495894(reporter);
+    test_crbug_613918();
     test_bad_cubic_crbug229478();
     test_bad_cubic_crbug234190();
     test_gen_id(reporter);
     test_path_close_issue1474(reporter);
     test_path_to_region(reporter);
     test_rrect(reporter);
     test_arc(reporter);
     test_arc_ovals(reporter);
     test_arcTo(reporter);
     test_addPath(reporter);
@@ skipping 10 matching lines @@
     PathTest_Private::TestPathTo(reporter);
     PathRefTest_Private::TestPathRef(reporter);
     PathTest_Private::TestPathrefListeners(reporter);
     test_dump(reporter);
     test_path_crbug389050(reporter);
     test_path_crbugskia2820(reporter);
     test_skbug_3469(reporter);
     test_skbug_3239(reporter);
     test_bounds_crbug_513799(reporter);
 }