CHROMIUM: Merge remote-tracking branch 'origin/master' into chromeos-iris

BUG=b:148192668, b:147162275, chromium:2015769, b:148055741
TEST=Check mesa build "emerge-dedede media-libs/mesa-iris" success and DUT
  should booted to graphics
TEST=Run Angry bird and Hill Climb Racing on volteer board
TEST=Run CTS dEQP-EGL* x86 ABI tests

Change-Id: Ib83e4cbcc90914177fb63b9bee6319094470e03a