Adding in a constant for hover slide opacity so that the hover is more visible in different windows variations (e.g., aero).
Adding in a constant for hover slide opacity so that the hover is more visible in different windows variations (e.g., aero).

Also fixing an issue where the hover glow would disappear immediately on mouse out rather than fading with the rest of the tab.

BUG=none
TEST=visual, ui_tests

Review URL: http://codereview.chromium.org/6250011

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@72377 0039d316-1c4b-4281-b951-d872f2087c98

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