Wrap Lock in a LazyInstance.
Wrap Lock in a LazyInstance.

This guarantees that the Lock constructor is not called until the Lock is needed. Previous code called the Lock constructor on process startup.

BUG=none
TEST=3D CSS on TOUCH_UI

Review URL: http://codereview.chromium.org/7812034

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@99029 0039d316-1c4b-4281-b951-d872f2087c98

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