am 90dc48b1: Merge "call into hwcomposer HAL when present" into gingerbread

Merge commit '90dc48b17f673b7e334e3254ea633450f994226c' into gingerbread-plus-aosp

* commit '90dc48b17f673b7e334e3254ea633450f994226c':
  call into hwcomposer HAL when present