cros: Fix app list bubble over-scroll at wrong position with hidden launcher.
cros: Fix app list bubble over-scroll at wrong position with hidden launcher.

This is because cached bubble bounds |view_bounds_| at bubble creation time
might not be correct when launcher is hidden and the bubble moves when launcher
shows up. The fix is to defer getting the bubble location until first
over-scroll movement.

BUG=150851
TEST=Verify app list bubble at expected location when over-scrolling with hidden launcher.

R=sky@chromium.org

Review URL: https://codereview.chromium.org/10967021

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@158007 0039d316-1c4b-4281-b951-d872f2087c98

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