am 66a4095c: Be more explicit about the rate at which sensor events must be returned

Merge commit '66a4095ca0ecfe89b10abe5402617450f57759cd' into gingerbread-plus-aosp

* commit '66a4095ca0ecfe89b10abe5402617450f57759cd':
  Be more explicit about the rate at which sensor events must be returned