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Calling GetFileInfo() is a blocking call and because the desktop feature
tracker needs the first run creation time, it was performing file I/O on
the UI thread causing jank. This change moves getting the creation time to
sentinel creation and caches that result in a static variable.

Bug: 785189
Change-Id: Ia4b4e5783bf3e6d06c9812661d7930384cbf9b21
Reviewed-on: https://chromium-review.googlesource.com/773445Reviewed-by: Carlos Pizano <cpu@chromium.org>
Reviewed-by: Robert Liao <robliao@chromium.org>
Reviewed-by: Wez <wez@chromium.org>
Commit-Queue: Bettina Dea <bdea@chromium.org>
Cr-Commit-Position: refs/heads/master@{#517914}