Fix typos in sky-drawer and sky-scrollable

sky/framework/fling-curve.dart

Index: sky/framework/fling-curve.dart
diff --git a/sky/framework/fling-curve.dart b/sky/framework/fling-curve.dart
index 6dce624dda84ad6d0643ace5290e864df0b03a1b..6a476d7085eb2c0a06d505a232b9615e6390aff5 100644
--- a/sky/framework/fling-curve.dart
+++ b/sky/framework/fling-curve.dart
@@ -9,15 +9,19 @@ const double _kDefaultBeta = 172.0;
 const double _kDefaultGamma = 3.7;
 
 double _positionAtTime(double t) {
-  return kDefaultAlpha * math.exp(-kDefaultGamma * t) - kDefaultBeta * t - kDefaultAlpha;
+  return _kDefaultAlpha * math.exp(-_kDefaultGamma * t)
+      - _kDefaultBeta * t
+      - _kDefaultAlpha;
 }
 
 double _velocityAtTime(double t) {
-  return -kDefaultAlpha * kDefaultGamma * math.exp(-kDefaultGamma * t) - kDefaultBeta;
+  return -_kDefaultAlpha * _kDefaultGamma * math.exp(-_kDefaultGamma * t)
+      - _kDefaultBeta;
 }
 
 double _timeAtVelocity(double v) {
-  return -math.log((v + kDefaultBeta) / (-kDefaultAlpha * kDefaultGamma)) / kDefaultGamma;
+  return -math.log((v + _kDefaultBeta) / (-_kDefaultAlpha * _kDefaultGamma))
+      / _kDefaultGamma;
 }
 
 final double _kMaxVelocity = _velocityAtTime(0.0);