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The InputMethodEngine needs to work with mojo-based & non-mojo-based clients in
a hybrid mode. For example, the app_list window seems not using
WindowTreeHostMus. Therefore, the engine needs to:
 - track the mojo client breakage, and can switch back to legacy mode to use
   IMEBridge.
 - mutes the FinishInput call as necessary when a non-mojo client calls FocusIn
   before the mojo client calls FinishInput. Otherwise it will confuse the IME
   extension (e.g. receives "onfocus" and later "onblur").

Bug: 937167
Change-Id: I9dc54156b6075d1636e8984d941948a680b365e3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1559414
Commit-Queue: Shu Chen <shuchen@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#649727}