| Index: sky/sdk/lib/framework/animation/mechanics.dart
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| diff --git a/sky/sdk/lib/framework/animation/mechanics.dart b/sky/sdk/lib/framework/animation/mechanics.dart
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| index 6a6cc4cad46f7f8c744afe9cd8ac06757e5ba1a8..1a2d10b278689e6bc3da7694585fdb5744aa104e 100644
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| --- a/sky/sdk/lib/framework/animation/mechanics.dart
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| +++ b/sky/sdk/lib/framework/animation/mechanics.dart
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| @@ -2,6 +2,8 @@
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|  // Use of this source code is governed by a BSD-style license that can be
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|  // found in the LICENSE file.
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|  
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| +library animation_mechanics;
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| +
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|  import 'dart:math' as math;
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|  
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|  const double kGravity = -0.980; // m^s-2
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| 
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