Clean up run-blink-httpd, run-blink-websocketserver, add tests.

Last in the series of refactoring patches to clean up all the layout test
server code and helpers.

R=scottmg@chromium.org
BUG=30536

Review URL: https://codereview.chromium.org/135653016

git-svn-id: svn://svn.chromium.org/blink/trunk@167562 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Do not change the value of a disabled SELECT element.

parseAttributes closes popup when the element becomes disabled.
    
We need to add some isDisabledFormControl checks to
menuListDefaultEventHandler because user events can be delivered to
disabled elements.

R=tkent
BUG=241079
TEST=automated

Review URL: https://codereview.chromium.org/159743002

git-svn-id: svn://svn.chromium.org/blink/trunk@167563 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Fixes the rendering of a SVG filter (e.g. feFlood) by testing against total
area instead of single dimension.

While fixing this bug, I noticed also layer violations in FilterEffectRenderer
and RenderSVGResourceFilter accessing the maximum size defined in FilterEffect
or replicating the test logic for maximum dimension. This patch also fixes
those issues.

BUG=240184

Review URL: https://codereview.chromium.org/150973004

git-svn-id: svn://svn.chromium.org/blink/trunk@167564 bbb929c8-8fbe-4397-9dbb-9b2b20218538