Reland of path ops: fix conic weight and partial coincidence

src/pathops/SkOpCoincidence.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #include "SkOpCoincidence.h"
 #include "SkOpSegment.h"
 #include "SkPathOpsTSect.h"
 
@@ skipping 187 matching lines @@
     }
     if (coinTs > coinTe) {
         SkTSwap(coinTs, coinTe);
         SkTSwap(oppTs, oppTe);
     }
     SkOpPtT* cs = coinSeg->addMissing(coinTs, oppSeg, allocator);
     SkOpPtT* ce = coinSeg->addMissing(coinTe, oppSeg, allocator);
     SkASSERT(cs != ce);
     SkOpPtT* os = oppSeg->addMissing(oppTs, coinSeg, allocator);
     SkOpPtT* oe = oppSeg->addMissing(oppTe, coinSeg, allocator);
-    SkASSERT(os != oe);
+//    SkASSERT(os != oe);
     cs->addOpp(os);
     ce->addOpp(oe);
     this->add(cs, ce, os, oe, allocator);
     return true;
 }
 
 /* detects overlaps of different coincident runs on same segment */
 /* does not detect overlaps for pairs without any segments in common */
 bool SkOpCoincidence::addMissing(SkChunkAlloc* allocator) {
     SkCoincidentSpans* outer = fHead;
@@ skipping 439 matching lines @@
     *overS = SkTMax(SkTMin(coin1s->fT, coin1e->fT), SkTMin(coin2s->fT, coin2e->fT));
     *overE = SkTMin(SkTMax(coin1s->fT, coin1e->fT), SkTMax(coin2s->fT, coin2e->fT));
     return *overS < *overE;
 }
 
 bool SkOpCoincidence::testForCoincidence(const SkCoincidentSpans* outer, const SkOpPtT* testS,
         const SkOpPtT* testE) const {
     return testS->segment()->testForCoincidence(testS, testE, testS->span(),
             testE->span(), outer->fCoinPtTStart->segment(), 120000);  // FIXME: replace with tuned
 }