Improved action animations in sprites

Improved action animations in sprites

Actions can only be added once
Makes sure instant actions are run on Repeat and RepeatForever
Adds ActionGroup which runs actions in parallell
Adds support for animation curves and easing
Makes it possible to animate sizes and rects

Fixes issue with SpriteBox not being updated

R=abarth@chromium.org

Committed: https://chromium.googlesource.com/external/mojo/+/10e650b606f1d22bebfaf70fed60ba491a03e9f9

[viktorl, 2015-07-10 19:05:49]

viktorl@google.com changed reviewers:
+ eseidel@chromium.org

[abarth-chromium, 2015-07-10 19:13:51]

abarth@chromium.org changed reviewers:
+ abarth@chromium.org

[abarth-chromium, 2015-07-10 19:13:52]

lgtm

https://codereview.chromium.org/1235653004/diff/1/sky/sdk/example/game/lib/sp...
File sky/sdk/example/game/lib/sprites.dart (right):

https://codereview.chromium.org/1235653004/diff/1/sky/sdk/example/game/lib/sp...
sky/sdk/example/game/lib/sprites.dart:8: import 'dart:math' as Math;
nit: We've been using the local name |math| rather than |Math| for this library.

https://codereview.chromium.org/1235653004/diff/1/sky/sdk/example/game/lib/sp...
sky/sdk/example/game/lib/sprites.dart:11: import
'package:sky/animation/curves.dart';
This should probably go below with the other package imports.

[viktorl, 2015-07-10 19:26:48]

Committed patchset #1 (id:1) manually as
10e650b606f1d22bebfaf70fed60ba491a03e9f9 (presubmit successful).

[viktorl, 2015-07-10 19:27:19]

On 2015/07/10 at 19:13:52, abarth wrote:
> lgtm
> 
>
https://codereview.chromium.org/1235653004/diff/1/sky/sdk/example/game/lib/sp...
> File sky/sdk/example/game/lib/sprites.dart (right):
> 
>
https://codereview.chromium.org/1235653004/diff/1/sky/sdk/example/game/lib/sp...
> sky/sdk/example/game/lib/sprites.dart:8: import 'dart:math' as Math;
> nit: We've been using the local name |math| rather than |Math| for this
library.
> 
>
https://codereview.chromium.org/1235653004/diff/1/sky/sdk/example/game/lib/sp...
> sky/sdk/example/game/lib/sprites.dart:11: import
'package:sky/animation/curves.dart';
> This should probably go below with the other package imports.

Fixed and landed