Add brillo_DiskSizeTest.

This implements the Brillo PTS minimum disk size test.

BUG=b:25341629
TEST=brillo_test_launcher.py -t brillo_DiskSizeTest ==> PASS
TEST=brillo_test_launcher.py -t brillo_DiskSizeTest -A path=/firmware ==>
     FAIL: Size of device /dev/block/mmcblk0p1 (65488) is less than required (65536)
TEST=brillo_test_launcher.py -t brillo_DiskSizeTest -A min_size=262144 ==>
     FAIL: Size of device /dev/block/mmcblk0p27 (124912) is less than required (262144)

Change-Id: Ic105411d353cf79c8e70df89ba36eec99ccf4cf9
Reviewed-on: https://chromium-review.googlesource.com/309780
Commit-Ready: Gilad Arnold <garnold@chromium.org>
Tested-by: Gilad Arnold <garnold@chromium.org>
Reviewed-by: Gilad Arnold <garnold@chromium.org>
3 files changed