harden and speed up path op unit tests

tests/PathOpsExtendedTest.h

Index: tests/PathOpsExtendedTest.h
diff --git a/tests/PathOpsExtendedTest.h b/tests/PathOpsExtendedTest.h
index 723135a33bd48d8a0e1157d0ee3da3ef3e9d9296..303d10cf2b140e3cf6468c3f96632839d0d9a025 100644
--- a/tests/PathOpsExtendedTest.h
+++ b/tests/PathOpsExtendedTest.h
@@ -28,6 +28,8 @@ extern bool drawAsciiPaths(const SkPath& one, const SkPath& two, bool drawPaths)
 extern void showOp(const SkPathOp op);
 extern bool testPathOp(skiatest::Reporter* reporter, const SkPath& a, const SkPath& b,
                         const SkPathOp , const char* testName = NULL);
+extern bool testThreadedPathOp(skiatest::Reporter* reporter, const SkPath& a, const SkPath& b,
+                        const SkPathOp , const char* testName = NULL);
 extern bool testSimplify(SkPath& path, bool useXor, SkPath& out, PathOpsThreadState& state,
                          const char* pathStr);
 extern bool testSimplify(skiatest::Reporter* reporter, const SkPath& path);