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This one step in a series of clean up refactoring changes
that will result in ui/base no longer having dependencies on
ui/events. This will allow ui/base to be treated more as the lowest
layer of the ui/ components.

This change adds a BUILD.gn to ui/base/idle to create a new
component. This is in preparation of doing the same for
ui/base/user_activity which has a dependency on ui/events
(and on which ui/base/idle has a dependency).

Bug: 921723
Change-Id: I1b98d33ce8dfd78309fd532cbfc2bb013453c83f
Reviewed-on: https://chromium-review.googlesource.com/c/1428563
Commit-Queue: Daniel Libby <dlibby@microsoft.com>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#627720}