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1eb13d0112
This CL cleans up the sky/framework/animation as follows: 1) I've moved code that's used only by the custom elements framework into sky/framework/elements/animation. This code is based on AnimationDelegates rather than Streams. 2) Rename ScrollCurve to ScrollBehavior because it encapsulates more behavior than just a curve. 3) Make the Generator interface explicit and mark subclasses as actual subclasses. 4) Move Simulation into generators.dart because it implements the Generator interface. 5) Move Animation out of generators.dart because it does not implement the Generator interface. R=eseidel@chromium.org Review URL: https://codereview.chromium.org/1001373002