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

* commit '4cb6c4ff1f4f4908a73354b916a91de5933f4a9f':
  gralloc: Adds a new inline method map_usage_to_memtrack.

Change-Id: I4b238805f3f060cfa6339dc2d4f7c16897979e6f