Increase the max file size for the flakiness dashboard to 30mb.

We have a couple bot that are hitting the current 20mb limit. That's
kind of absurd, but there's work in progress to make the json more
compact. In the meantime, this avoids 500s and keeps everything functioning.

Also, increase the min time for pruning for debug bots so we prune
more and make the JSON smaller. We increased the default timeout for
debug bots, so it makes sense to increase this as well.

NOTRY=true

Review URL: https://chromiumcodereview.appspot.com/19968006

git-svn-id: svn://svn.chromium.org/blink/trunk@154685 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Add an isolate file for webkit_unit_tests on Android.

BUG=263019
TEST=webkit_unit_tests
R=abarth@chromium.org, maruel@chromium.org

Review URL: https://codereview.chromium.org/19719003

git-svn-id: svn://svn.chromium.org/blink/trunk@154686 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Unreviewed gardening

css3/filters/composited-during-animation-layertree.html is flaky on all platforms.

TBR=
BUG=

Review URL: https://codereview.chromium.org/19699012

git-svn-id: svn://svn.chromium.org/blink/trunk@154687 bbb929c8-8fbe-4397-9dbb-9b2b20218538