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ShowImeIfNeeded() must be explicitly called to bring up the virtual keyboard
when the device is in touch mode.

This is a short-term solution covering only basic use cases. Notably,
it doesn't handle the case when the user dismissed the keyboard manually and
then re-clicked an ARC text field yet.

BUG=581282
BUG=b/25865847

Review URL: https://codereview.chromium.org/1605273002

Cr-Commit-Position: refs/heads/master@{#371481}