Fix incremental builds for SDK. [DO NOT MERGE]

Atree used to output files without escaping the filenames. This resulted
in breaks for incremental builds when filenames contained '$' symbol.
The change fixes this by escaping the filename properly.

Change-Id: I957787b1b3536c64ba6fcb5b4bb5fc60e8b04452
(cherry picked from commit 9c5564e0)