Testing push
Merge pull request #170 from mbebenita/master

Some optimizations around trampolines and memoizers.
Fixes Kanvas.currentTransform and video positioning
Merge pull request #172 from yurydelendik/video-pos

Fixes Kanvas.currentTransform and video positioning
Fixes video and background for the extension
Fixes AVM1 onXxxxx event handler
Merge pull request #174 from yurydelendik/avm1-2

Fixes AVM1 onXxxxx event handler
Relax assertion for arcTo
Disable TextField draw if |bbox| is falsy.
Fix type-o.
Remove assertion in the IR builder for runtime namespace nodes.