working on initial winding for cubics

Path ops works well for all tests except for cubics.
Isolate failures caused by cubics, and do a better job of computing
the initial winding for cubics.

TBR=reed@google.com
BUG=skia:3588

Review URL: https://codereview.chromium.org/1096923003
diff --git a/src/pathops/SkPathOpsCommon.cpp b/src/pathops/SkPathOpsCommon.cpp
index a16e811..e766f5a 100644
--- a/src/pathops/SkPathOpsCommon.cpp
+++ b/src/pathops/SkPathOpsCommon.cpp
@@ -446,6 +446,9 @@
     SkChunkAlloc allocator(4096);  // FIXME: constant-ize, tune
     SkOpContour contour;
     SkOpGlobalState globalState(NULL  SkDEBUGPARAMS(&contour));
+#if DEBUG_SHOW_TEST_NAME
+    SkDebugf("</div>\n");
+#endif
 #if DEBUG_PATH_CONSTRUCTION
     SkDebugf("%s\n", __FUNCTION__);
 #endif