Fix build for nexus 5 (hammerhead) camera with gcc-4.8+
-Wno-error=unused-parameter

Signed-off-by: Paul Beeler <sparksco@gmail.com>

Conflicts:
	.gitignore
Fix
Thx to vanir
set unused attribute for unused variables

Summary: Fixes build with clang and Werror

Test Plan: verified

Reviewers: randall.rushing, synergy

Reviewed By: synergy

Differential Revision: http://review.codefirex.com/D136