
Add a toString() method for SourceFile to help with debugging.

Contibuted to the SVN repo by mbolin.

Revision created by MOE tool push_codebase.

R=acleung
DELTA=5  (5 added, 0 deleted, 0 changed)


Revision created by MOE tool push_codebase.
MOE_MIGRATION=335939


ajukraine/closure-compiler,olegshnitko/closure-compiler,ajukraine/closure-compiler,olegshnitko/closure-compiler