Change the behavior of SuggestionSpan.

SuggestionSpan can be accessed in two different ways:

- by tapping on the text (easy access)
- by tapping on "replace" pop-up (not easy and difficult to discover)

The "easy access" will be used for dictionary suggestions and voice recognition suggestions.

The suggestion span can be rendered into two different way:

- default, text is underlined in blue
- spelling error, text is underlined in red

Change-Id: I0af0fe6700d0ad588facb21c021dc6f59ef172f1