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In ExecutePerformActions function, we dispatch key events first, mouse
events then touch events, but we should dispatch whatever actions come
first in the action sequence. This CL changes high level of structures
of processing actions and dispatching events in the action sequence,
and I still need to refactor some details when procession the actions
in a following CL.

Bug: 606367
Change-Id: I46e02e547d0e5d5c2ddcdc949efc6b141142ea2c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1759855Reviewed-by: John Chen <johnchen@chromium.org>
Commit-Queue: Lan Wei <lanwei@chromium.org>
Cr-Commit-Position: refs/heads/master@{#688692}