During reflection use FieldPacker.addI16 for half

http://b/27526302

Update PrimitiveTypePackerAPINameMap to use addI16 as the field packer
method to use for half type for setting globals or to construct an
invokable's parameters.

Change-Id: I5c96b0f8b709334087671bd75921523514ad94f1
(cherry picked from commit 29456ca8e5994f43e65ad0a51982c5c2d0677657)
5 files changed