am 60d641e5: Merge "first stab at hwcomposer HAL and default implementation." into gingerbread

Merge commit '60d641e5eb197918d078d9aaeea623c48d8474b7' into gingerbread-plus-aosp

* commit '60d641e5eb197918d078d9aaeea623c48d8474b7':
  first stab at hwcomposer HAL and default implementation.