Change-Id: Ied821df01e032ebc913d2f15dffdf41a51372ea4
This is a ground work for subsequent CLs. BUG: 16995261 Change-Id: Icbb708a35412a635a0d625b520069840c0bb0904
This adds unittest for SuggestionSpanUtils for subsequent CLs. No behavior change is intended in this CL. BUG: 16995261 Change-Id: I90d1591cab893a1421ca633963b7c8f00a5fe4b4