add conics to path ops

src/pathops/SkReduceOrder.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #include "SkReduceOrder.h"
 
 int SkReduceOrder::reduce(const SkDLine& line) {
     fLine[0] = line[0];
@@ skipping 253 matching lines @@
     SkReduceOrder reducer;
     int order = reducer.reduce(quad);
     if (order == 2) {  // quad became line
         for (int index = 0; index < order; ++index) {
             *reducePts++ = reducer.fLine[index].asSkPoint();
         }
     }
     return SkPathOpsPointsToVerb(order - 1);
 }
 
+SkPath::Verb SkReduceOrder::Conic(const SkPoint a[3], SkScalar weight, SkPoint* reducePts) {
+    SkPath::Verb verb = SkReduceOrder::Quad(a, reducePts);
+    if (verb > SkPath::kLine_Verb && weight == 1) {
+        return SkPath::kQuad_Verb;
+    }
+    return verb == SkPath::kQuad_Verb ? SkPath::kConic_Verb : verb;
+}
+
 SkPath::Verb SkReduceOrder::Cubic(const SkPoint a[4], SkPoint* reducePts) {
     if (SkDPoint::ApproximatelyEqual(a[0], a[1]) && SkDPoint::ApproximatelyEqual(a[0], a[2])
             && SkDPoint::ApproximatelyEqual(a[0], a[3])) {
         reducePts[0] = a[0];
         return SkPath::kMove_Verb;
     }
     SkDCubic cubic;
     cubic.set(a);
     SkReduceOrder reducer;
     int order = reducer.reduce(cubic, kAllow_Quadratics);
     if (order == 2 || order == 3) {  // cubic became line or quad
         for (int index = 0; index < order; ++index) {
             *reducePts++ = reducer.fQuad[index].asSkPoint();
         }
     }
     return SkPathOpsPointsToVerb(order - 1);
 }