Set svn:executable bit on scripts that are executable.
Set svn:executable bit on scripts that are executable.

This file is committed independently because it cannot be tested on the try
server.

Original review at https://chromiumcodereview.appspot.com/10165021/

TBR=mark@chromium.org
BUG=
TEST=

Review URL: https://chromiumcodereview.appspot.com/10169027

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@133434 0039d316-1c4b-4281-b951-d872f2087c98

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