Allow for subclassing of StatmentFusion pass.
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Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=43537365
Declare the $root property explicitly so that it doesn't get renamed during compilation (an oversight from the last CL, whoops).
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Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=43543813
Add a bang to angular.Scope.$root's type
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Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=43556821