fix cubic/line intersection; add skp tests

tests/PathOpsExtendedTest.cpp

Index: tests/PathOpsExtendedTest.cpp
diff --git a/tests/PathOpsExtendedTest.cpp b/tests/PathOpsExtendedTest.cpp
index 08954327e96cfd99debdcace5700fe8f4d035abb..280307a775dc2d59376d58bdc4ba8f95db00d6b1 100644
--- a/tests/PathOpsExtendedTest.cpp
+++ b/tests/PathOpsExtendedTest.cpp
@@ -410,12 +410,13 @@ static void showPathOpPath(const char* testName, const SkPath& one, const SkPath
     SkDebugf("static void %s(skiatest::Reporter* reporter, const char* filename) {\n", testName);
     *gTestOp.append() = shapeOp;
     ++gTestNo;
+    SkDebugf("\n*** this test fails ***\n");
     SkDebugf("    SkPath path, pathB;\n");
     showPath(a, "path", false);
     showPath(b, "pathB", false);
     SkDebugf("    testPathOp(reporter, path, pathB, %s, filename);\n", opStrs[shapeOp]);
     SkDebugf("}\n");
-    drawAsciiPaths(scaledOne, scaledTwo, false);
+    drawAsciiPaths(scaledOne, scaledTwo, true);
 }
 
 void ShowTestArray() {