gralloc: Adds a new inline method map_usage_to_memtrack. am: 4cb6c4ff1f
am: f657cb5d57

* commit 'f657cb5d5718c38b324d8ae2fc718799f7d84733':
  gralloc: Adds a new inline method map_usage_to_memtrack.

Change-Id: Icb977e60fbfddc6fcfc595c871627ffab4ade6d8