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The proxy IME in Android sometimes fail to find the appropriate
KeyboardCode for a Android's KEYCODE. The proxy IME uses
ui::VKEY_UNKNOWN for the key event.
However, it's rejected in a validation code and the mojo connection is
closed as a result.
This CL adds a new optional field in KeyEventData struct for a scan code
of a key event.
The field will be used when the proxy IME fails to find the appropriate
KeyboardCode.

Bug: b:174259561
Test: component_unittests
Change-Id: If4cf5514bdb6cc7026964025e42e4ae6bc3e57b0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2567141
Commit-Queue: Yuichiro Hanada <yhanada@chromium.org>
Reviewed-by: Jorge Lucangeli Obes <jorgelo@chromium.org>
Reviewed-by: Tetsui Ohkubo <tetsui@chromium.org>
Cr-Commit-Position: refs/heads/master@{#833105}