Add a target to produce a SyzyASan instrumented build of content_shell.

A further CL will use this target to add this artifact to the Windows SyzyASan LKGR archives.

BUG=

Review URL: https://codereview.chromium.org/25061002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@226150 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 226150