Reland of path ops: fix conic weight and partial coincidence

src/pathops/SkPathOpsCubic.h

Index: src/pathops/SkPathOpsCubic.h
diff --git a/src/pathops/SkPathOpsCubic.h b/src/pathops/SkPathOpsCubic.h
index 9fd0f171e24e39caa769db6728b4e15305ffdb91..16bca79533198e8834f9ebf7e70d2790b3e8bb67 100644
--- a/src/pathops/SkPathOpsCubic.h
+++ b/src/pathops/SkPathOpsCubic.h
@@ -41,7 +41,7 @@
         return v03.dot(v01) > 0 && v03.dot(v02) > 0 && v03.dot(v13) > 0 && v03.dot(v23) > 0;
     }
 
-    static bool IsCubic() { return true; }
+    static bool IsConic() { return false; }
 
     const SkDPoint& operator[](int n) const { SkASSERT(n >= 0 && n < kPointCount); return fPts[n]; }
     SkDPoint& operator[](int n) { SkASSERT(n >= 0 && n < kPointCount); return fPts[n]; }