Adding additional build rules for .S / .cxx (Patch from peterhal).
Adding additional build rules for .S / .cxx
(Patch from peterhal).

BUG=None
TEST=None

Review URL: http://codereview.chromium.org/753002

git-svn-id: e7e1075985beda50ea81ac4472467b4f6e91fc78@807 78cadc50-ecff-11dd-a971-7dbc132099af

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