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IME service always expects an OnInputMethodChanged message first, then
an OnFocus.

However, if we enable NativeInputMethodEngine and then immediately
focus, it will send out OnFocus then OnInputMethodChanged.

This is because OnInputMethodChanged is sent in an async callback,
which may run after we send OnFocus.

Move the code to send OnInputMethodChanged out of the callback and call
it immediately after connecting to IME service. This is ok because Mojo
will queue up any messages automatically if the IME service is not yet
ready.

Bug: b/172990698
Change-Id: I81bc0062f867131d0c8faf32411a845f676b5aeb
Fixed: b/172990698
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2537443
Commit-Queue: Darren Shen <shend@chromium.org>
Reviewed-by: My Nguyen <myy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#828044}