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Before this change, URL of custom input view of IMEs, which is loaded
by ChromeKeyboardUI when an user invokes Virtual Keyboard, is stored
in global variables in keyboard_content_util and everyone can override
it accidentally.
This change moves that state into InputMethodManagerImpl and adds some
methods to interact with that state.

Bug: 819018
Test: Related unit tests pass and manual testing with ime menu tray.
Change-Id: Ic6f8e0e108c3706ad1ff2ce90aeeb1388704ff36
Reviewed-on: https://chromium-review.googlesource.com/953023
Commit-Queue: Yuichiro Hanada <yhanada@chromium.org>
Reviewed-by: Shu Chen <shuchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543864}