Add time return argument to SkCurveMeasure's getPosTan, rename to getPosTanTime

src/utils/SkCurveMeasure.h

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkCurveMeasure_DEFINED
 #define SkCurveMeasure_DEFINED
 
@@ skipping 29 matching lines @@
     Sk8f xCoeff[3];
     Sk8f yCoeff[3];
 };
 
 class SkCurveMeasure {
 public:
     SkCurveMeasure() {}
     SkCurveMeasure(const SkPoint* pts, SkSegType segType);
 
     SkScalar getTime(SkScalar targetLength);
-    void getPosTan(SkScalar distance, SkPoint* pos, SkVector* tan);
+    void getPosTanTime(SkScalar distance, SkPoint* pos, SkVector* tan, SkScalar* time);
     SkScalar getLength();
 
 private:
     SkPoint evaluateQuad(SkScalar t);
     SkVector evaluateQuadDerivative(SkScalar t);
     //SkPoint evaluate_cubic(SkScalar t);
     //SkVector evaluate_cubic_derivative(SkScalar t);
     //SkPoint evaluate_conic(SkScalar t);
     //SkVector evaluate_conic_derivative(SkScalar t);
 
     const SkScalar kTolerance = 0.0001f;
     const int kNewtonIters = 5;
     const int kBisectIters = 5;
 
     SkSegType fSegType;
     SkPoint fPts[4];
     SkScalar fLength = -1.0f;
     ArcLengthIntegrator fIntegrator;
 
     // for debug purposes
     int fIters;
 };
 
 #endif  // SkCurveMeasure_DEFINED