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keep-typing feature: when the suggestion pops up and the user keeps
typing, if what they type is a prefix of the suggestion, the popup will
not disappear, and in the suggestion text the typed prefix will be
displayed in black and bold. The popup will disappear anyway if the user
has typed more than 10 characters.

Test: tested with Linux emulator
Bug: 1042084
Change-Id: I157cd92cf29bb308e09764109d2eb0333183af7a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2153181
Commit-Queue: Jing Wang <jiwan@chromium.org>
Reviewed-by: Keith Lee <keithlee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#760375}