Layout Test platform/chromium/compositing/filters/background-filter-blur-outsets...

Layout Test platform/chromium/compositing/filters/background-filter-blur-outsets.html is failing
https://bugs.webkit.org/show_bug.cgi?id=84072

Reviewed by Adrienne Walker.

Use onload and layoutTestController.display() to ensure the page is
loaded and compositor is ready before setting the background blur.

Also, smaller blur for faster test bots.

* platform/chromium-linux/platform/chromium/compositing/filters/background-filter-blur-outsets-expected.png:
* platform/chromium-linux/platform/chromium/compositing/filters/background-filter-blur-outsets-expected.txt:
* platform/chromium/compositing/filters/background-filter-blur-off-axis.html:
* platform/chromium/compositing/filters/background-filter-blur-outsets.html:
* platform/chromium/compositing/filters/background-filter-blur.html:

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@114995 268f45cc-cd09-0410-ab3c-d52691b4dbfc