harden and speed up path op unit tests

tests/PathOpsDLineTest.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
+#include "PathOpsTestCommon.h"
 #include "SkPathOpsLine.h"
 #include "Test.h"
 
 static const SkDLine tests[] = {
     {{{2, 1}, {2, 1}}},
     {{{2, 1}, {1, 1}}},
     {{{2, 1}, {2, 2}}},
     {{{1, 1}, {2, 2}}},
     {{{3, 0}, {2, 1}}},
     {{{3, 2}, {1, 1}}},
 };
 
 static const SkDPoint left[] = {
     {2, 1},
     {1, 0},
     {1, 1},
     {1, 2},
     {2, 0},
     {2, 1}
 };
 
 static const size_t tests_count = SK_ARRAY_COUNT(tests);
 
 static void PathOpsLineUtilitiesTest(skiatest::Reporter* reporter) {
     for (size_t index = 0; index < tests_count; ++index) {
         const SkDLine& line = tests[index];
+        SkASSERT(ValidLine(line));
         SkDLine line2;
         SkPoint pts[2] = {line[0].asSkPoint(), line[1].asSkPoint()};
         line2.set(pts);
         REPORTER_ASSERT(reporter, line[0] == line2[0] && line[1] == line2[1]);
         const SkDPoint& pt = left[index];
+        SkASSERT(ValidPoint(pt));
         double result = line.isLeft(pt);
         if ((result <= 0 && index >= 1) || (result < 0 && index == 0)) {
             SkDebugf("%s [%d] expected left\n", __FUNCTION__, index);
             REPORTER_ASSERT(reporter, 0);
         }
         line2 = line.subDivide(1, 0);
         REPORTER_ASSERT(reporter, line[0] == line2[1] && line[1] == line2[0]);
         line2 = SkDLine::SubDivide(pts, 1, 0);
         REPORTER_ASSERT(reporter, line[0] == line2[1] && line[1] == line2[0]);
         SkDPoint mid = line.xyAtT(.5);
         REPORTER_ASSERT(reporter, approximately_equal((line[0].fX + line[1].fX) / 2, mid.fX));
         REPORTER_ASSERT(reporter, approximately_equal((line[0].fY + line[1].fY) / 2, mid.fY));
     }
 }
 
 #include "TestClassDef.h"
 DEFINE_TESTCLASS_SHORT(PathOpsLineUtilitiesTest)