Chameleon: Generate the calibration images during the test

So far we pre-generated several calibration images (PNG files), one per
resolution. It does not scale when adding a new resolution. We should
generate the images during the test by given the resolutions. SVG image
format is better for doing this thing. We can easy to change its XML text
content to scale to different image size.

BUG=chromium:367014
TEST=Tested the display_Resolution test:
$ test_that --args "chameleon_host=$CHAMELEON" $DUT display_Resolution.mirrored

Change-Id: I648481ade0ef5560a714f0908a493665e125f909
Reviewed-on: https://chromium-review.googlesource.com/197012
Reviewed-by: Wai-Hong Tam <waihong@chromium.org>
Commit-Queue: Wai-Hong Tam <waihong@chromium.org>
Tested-by: Wai-Hong Tam <waihong@chromium.org>
10 files changed