spec: add --disable-impl-side-painting switch to chromedriver setup
spec: add --disable-impl-side-painting switch to chromedriver setup

Test Plan:
- Specs pass in firefox
- Should fix 'no such session' error in chrome builds

Change-Id: I05a05260f8b6edc9cb8a4038e5990cae8eff681d
Reviewed-on: https://gerrit.instructure.com/75151
Reviewed-by: Matthew Edwards <af4636458a6324015a1b5ec4bff45dafe667fa2b@instructure.com>
Reviewed-by: Pedro Fajardo <121b528f0c2f2e923ce3103793aca31b9a662ac4@instructure.com>
Tested-by: Jenkins
Product-Review: Matt Fairbourn <5f353e1c97bb9cc046b9db20beca0b9392f6f1b2@instructure.com>
QA-Review: Matt Fairbourn <5f353e1c97bb9cc046b9db20beca0b9392f6f1b2@instructure.com>

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