Reland of path ops: fix conic weight and partial coincidence

src/pathops/SkPathOpsQuad.h

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkPathOpsQuad_DEFINED
 #define SkPathOpsQuad_DEFINED
 
@@ skipping 27 matching lines @@
 
     void debugInit() {
         sk_bzero(fPts, sizeof(fPts));
     }
 
     SkDQuad flip() const {
         SkDQuad result = {{fPts[2], fPts[1], fPts[0]}};
         return result;
     }
 
-    static bool IsCubic() { return false; }
+    static bool IsConic() { return false; }
 
     const SkDQuad& set(const SkPoint pts[kPointCount]) {
         fPts[0] = pts[0];
         fPts[1] = pts[1];
         fPts[2] = pts[2];
         return *this;
     }
 
     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]; }
@@ skipping 32 matching lines @@
     // utilities callable by the user from the debugger when the implementation code is linked in
     void dump() const;
     void dumpID(int id) const;
     void dumpInner() const;
 
 private:
 //  static double Tangent(const double* quadratic, double t);  // uncalled
 };
 
 #endif