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For some RTL page with 0 document.documentElement.scrollLeft and
non 0 document.body.scrollLeft, we should not take the
document.body.scrollLeft to calculate DevTools page.capturescreenshot
depending on doctype.
Instead, we can use window.pageXOffset and pageYOffset that should work
with any doctype.

Bug: chromedriver:3625
Change-Id: I38a06b854d26d6039c89b74d89509ef39a9bc18d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2482048Reviewed-by: John Chen <johnchen@chromium.org>
Commit-Queue: Shengfa Lin <shengfa@google.com>
Cr-Commit-Position: refs/heads/master@{#818532}