gdb: check in a gdb module for printing string16
gdb: check in a gdb module for printing string16

This just reuses the string-printing code from the WebKit module.

Review URL: http://codereview.chromium.org/6596118

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@76680 0039d316-1c4b-4281-b951-d872f2087c98

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