path ops -- rewrite angle sort

src/pathops/SkPathOpsQuad.h

Index: src/pathops/SkPathOpsQuad.h
===================================================================
--- src/pathops/SkPathOpsQuad.h	(revision 9425)
+++ src/pathops/SkPathOpsQuad.h	(working copy)
@@ -19,6 +19,11 @@
 struct SkDQuad {
     SkDPoint fPts[3];
 
+    SkDQuad flip() const {
+        SkDQuad result = {{fPts[2], fPts[1], fPts[0]}};
+        return result;
+    }
+
     void set(const SkPoint pts[3]) {
         fPts[0] = pts[0];
         fPts[1] = pts[1];
@@ -29,6 +34,7 @@
     SkDPoint& operator[](int n) { SkASSERT(n >= 0 && n < 3); return fPts[n]; }
 
     static int AddValidTs(double s[], int realRoots, double* t);
+    void align(int endIndex, SkDPoint* dstPt) const;
     SkDQuadPair chopAt(double t) const;
     SkDVector dxdyAtT(double t) const;
     static int FindExtrema(double a, double b, double c, double tValue[1]);