Fix convexicator bug

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 "SkCanvas.h"
 #include "SkPaint.h"
 #include "SkParse.h"
@@ skipping 1177 matching lines @@
             strokedSin.moveTo(x, y);
         } else {
             strokedSin.lineTo(x, y);
         }
     }
     SkStrokeRec stroke(SkStrokeRec::kFill_InitStyle);
     stroke.setStrokeStyle(2 * SK_Scalar1);
     stroke.applyToPath(&strokedSin, strokedSin);
     check_convexity(reporter, strokedSin, SkPath::kConcave_Convexity);
     check_direction(reporter, strokedSin, kDontCheckDir);
+
+    // http://crbug.com/412640
+    SkPath degenerateConcave;
+    degenerateConcave.moveTo(148.67912f, 191.875f);
+    degenerateConcave.lineTo(470.37695f, 7.5f);
+    degenerateConcave.lineTo(148.67912f, 191.875f);
+    degenerateConcave.lineTo(41.446522f, 376.25f);
+    degenerateConcave.lineTo(-55.971577f, 460.0f);
+    degenerateConcave.lineTo(41.446522f, 376.25f);
+    check_convexity(reporter, degenerateConcave, SkPath::kConcave_Convexity);
+    check_direction(reporter, degenerateConcave, SkPath::kUnknown_Direction);
 }
 
 static void check_convex_bounds(skiatest::Reporter* reporter, const SkPath& p,
                                 const SkRect& bounds) {
     REPORTER_ASSERT(reporter, p.isConvex());
     REPORTER_ASSERT(reporter, p.getBounds() == bounds);
 
     SkPath p2(p);
     REPORTER_ASSERT(reporter, p2.isConvex());
     REPORTER_ASSERT(reporter, p2.getBounds() == bounds);
@@ skipping 2366 matching lines @@
     test_addEmptyPath(reporter, SkPath::kExtend_AddPathMode);
     test_addEmptyPath(reporter, SkPath::kAppend_AddPathMode);
     test_conicTo_special_case(reporter);
     test_get_point(reporter);
     test_contains(reporter);
     PathTest_Private::TestPathTo(reporter);
     PathRefTest_Private::TestPathRef(reporter);
     test_dump(reporter);
     test_path_crbugskia2820(reporter);
 }