ash: Add a UMA entry for long-duration stationary touches.
ash: Add a UMA entry for long-duration stationary touches.

BUG=168409

Review URL: https://codereview.chromium.org/12033094

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@178850 0039d316-1c4b-4281-b951-d872f2087c98

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