Annotate the typed word with its source dictionary

...when applicable of course. This will allow for informing the
language switching authorities that the typed word was a
specific language, instead of leaving them in the dark.

Bug: 18063142
Bug: 18130489
Bug: 18132240
Bug: 18136721
Bug: 18200415
Change-Id: Ice3e7026a68c3018f54d730ec84f6762bf55899b