Also add empty implementation for dictionary
facilitator iteration APIs
Change-Id: Ia847e3faa75075c819fcfda89193d1024d2d5aca

Change-Id: I084a251b0f72288243c73b6166d992b427449635

There should be 1 executor each for static and dynamic language models.
This prevents too many dynamic LM updates from running in parallel,
competing for resources.

Change-Id: I8ec439e0ea2d92fba275bc20a0b8c9193346a0c1

Break contacts binary dictionary into two parts
- one that talks to contacts content provider and maintains
  local state. Includes a manager class and a content observer
- other one that just manages the dict code.

Change-Id: Ie8f89ac9ce174c803ff3168ee0bee5cbe7721d5b