Implemented expression range shifting for IE block size transformation. Moved expression range shifting for both transformations inside the transformation classes. Modified constructors/instance variables for the JsAbstractTextTransformer to support updating the expression ranges in the SourceInfo map.

Review at http://gwt-code-reviews.appspot.com/1451801

Review by: zundel@google.com

git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@10224 8db76d5a-ed1c-0410-87a9-c151d255dfc7