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

bench/MeasureBench.cpp

Index: bench/MeasureBench.cpp
diff --git a/bench/MeasureBench.cpp b/bench/MeasureBench.cpp
index d76bd3568c20be4aceed1a95b4be045209173814..1b0ec21dc96126e2e95e1f2924c20dcd0ad26904 100644
--- a/bench/MeasureBench.cpp
+++ b/bench/MeasureBench.cpp
@@ -88,7 +88,7 @@ class MeasureBench : public Benchmark {
 
         SkPoint point;
         for (size_t i = 0; i <= fPieces; i++) {
-            meas.getPosTan(i*pieceLength, &point, nullptr);
+            meas.getPosTanTime(i*pieceLength, &point, nullptr, nullptr);
         }
     }