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

src/utils/SkCurveMeasure.cpp

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkCurveMeasure.h"
 
 // for abs
@@ skipping 216 matching lines @@
 
         iterations++;
     }
 
     // debug. is there an SKDEBUG or something for ifdefs?
     fIters = iterations;
 
     return currentT;
 }
 
-void SkCurveMeasure::getPosTan(SkScalar targetLength, SkPoint* pos,
-                               SkVector* tan) {
+void SkCurveMeasure::getPosTanTime(SkScalar targetLength, SkPoint* pos,
+                               SkVector* tan, SkScalar* time) {
     SkScalar t = getTime(targetLength);
 
+    if (time) {
+        *time = t;
+    }
     if (pos) {
         // TODO(hstern) switch here on curve type.
         *pos = evaluateQuad(t);
     }
     if (tan) {
         // TODO(hstern) switch here on curve type.
         *tan = evaluateQuadDerivative(t);
     }
 }
 
@@ skipping 23 matching lines @@
     SkScalar By = fPts[1].y();
     SkScalar Cy = fPts[2].y();
 
     SkScalar A2BCx = 2.0f*(Ax - 2*Bx + Cx);
     SkScalar A2BCy = 2.0f*(Ay - 2*By + Cy);
     SkScalar ABx = 2.0f*(Bx - Ax);
     SkScalar ABy = 2.0f*(By - Ay);
 
     return SkPoint::Make(A2BCx*t + ABx, A2BCy*t + ABy);
 }