perf: Make the plot shorter, makes the UI usable on a Pixel chromebook.
perf: Make the plot shorter, makes the UI usable on a Pixel chromebook.

Screenshot:
   https://screenshot.googleplex.com/YdPnjgTBTxq.png

BUG=skia:

Change-Id: I196f1b8205bffd757c409bd173a31bd61ca1f20e
Reviewed-on: https://skia-review.googlesource.com/5303
Reviewed-by: Joe Gregorio <b9cf2471ff6d33504cafe8e6f356b732b2cadced@google.com>
Commit-Queue: Joe Gregorio <b9cf2471ff6d33504cafe8e6f356b732b2cadced@google.com>

google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot