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Add accelerator SHOW_IME_MENU_BUBBLE into table kActionsAllowedAtLoginOrLockScreen to allow using 'Alt+Shift+K' to open opt-in IME menu in login or lock screen.

BUG=668394,642423
TEST=Verified on local build.

Review-Url: https://codereview.chromium.org/2566583004
Cr-Commit-Position: refs/heads/master@{#437978}