Formerly, the annotation layer interface provided the GrAnnotation
library as a parameter to the `annotate` method. This was so the layer
would not necessarily need to import the library at the module level
and instead could use it as a utility toolbox.
With this change, the library is no-longer part of the interface and the
layers are now expected to import it at the module layer (if they have
a use for it).
Change-Id: I49b96c67ec724708c2861ab6be3ce27a53cc1b05
5c5f00fb13