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This CL introduces GetEnableFlags to the mojo API so that
GetKeyboardLayout can be moved from keyboard_util.cc/h to
chrome_virtual_keyboard_delegate.cc (the only place it was used).

It also moves the implementaiton of GetKeyboardWindow to
ChromeKeyboardControllerClient.

BUG=876138

Change-Id: I83bca47c9a038f9be2bb3322c5500996d898f21b
Reviewed-on: https://chromium-review.googlesource.com/c/1330327
Commit-Queue: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Shu Chen <shuchen@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#607285}