treat backwards quads as not convex

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 20 matching lines @@
     SkRRect rrect;
     rrect.setRectRadii(bounds, radii);
     REPORTER_ASSERT(reporter, bounds == rrect.rect());
 
     SkPath path;
     // this line should not assert in the debug build (from validate)
     path.addRRect(rrect);
     REPORTER_ASSERT(reporter, bounds == path.getBounds());
 }
 
+static void test_skbug_3469(skiatest::Reporter* reporter) {
+    SkPath path;
+    path.moveTo(20, 20);
+    path.quadTo(20, 50, 80, 50);
+    path.quadTo(20, 50, 20, 80);
+    REPORTER_ASSERT(reporter, !path.isConvex());
+}
+
 static void test_skbug_3239(skiatest::Reporter* reporter) {
     const float min = SkBits2Float(0xcb7f16c8); /* -16717512.000000 */
     const float max = SkBits2Float(0x4b7f1c1d); /*  16718877.000000 */
     const float big = SkBits2Float(0x4b7f1bd7); /*  16718807.000000 */
 
     const float rad = 33436320;
 
     const SkRect rectx = SkRect::MakeLTRB(min, min, max, big);
     const SkRect recty = SkRect::MakeLTRB(min, min, big, max);
 
@@ skipping 3674 matching lines @@
     test_extendClosedPath(reporter);
     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);
+    test_skbug_3469(reporter);
     test_skbug_3239(reporter);
 }