Restructure the events target into two components:

Restructure the events target into two components:

- events_base (built by most people) - defining some basic utilities.
- events (built by users of aura/views) - the ui::Event type & friends.

Prior to this there was one target, and platforms that did not want ui::Event would exclude those files explicitly, making it hard to build those files on those platforms without breaking other components.

R=sadrul@chromium.org
BUG=none

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=233347

[sadrul, 2013-11-05 03:29:19]

lgtm

(You may need to put back some of the dependencies on events you are removing to
fix some of the build failures)

[Ben Goodger (Google), 2013-11-06 20:38:13]

Committed patchset #9 manually as r233347 (presubmit successful).