Begin work on the PopupMenu entrance animation
This CL also refactors how animations work, particularly for the Drawer. I've renamed DrawerAnimation to DrawerController and switched it from being an Animation to having an Animation. I've also renamed Animation to AnimatedValue to capture the idea that the class actually presents the value being animated. Finally, I've factored AnimatedValueListener out of Drawer so that it can be used by PopupMenuItem as well. Finally, I've added a scheduleBuild convienence function to Component instead of having to call setState(() {}), which has come up a couple times. R=eseidel@chromium.org Review URL: https://codereview.chromium.org/1016093002
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