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After some testing we have determined that the following
pattern results in a more appropriate behavior when sending
key press/release events to clients:

- Send key press events if they have not been handled and
  are not already pressed.
- Send key release events if they are currently pressed.

This should reduce the chance that a client ends up with
an inappropriate keyboard state where some keys are
incorrectly pressed.

Bug: 820641
Test: exo_unittests --gtest_filter=KeyboardTest.OnKeyboardKey
Change-Id: Ica7b5510928056b6659140cf492e40234a272053
Reviewed-on: https://chromium-review.googlesource.com/1038907Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
Commit-Queue: David Reveman <reveman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#555389}