Add an interface for JS comments, which is implemented by wrapping either the old Comment type (from rhino_head) or the one produced by the new parser.
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Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=62729065
Harden $jscomp.typecheck.prettify_ against string conversions throwing
exceptions.
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Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=62758591
Add $sanitize service.
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Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=62759824