Revert of Remove FOUC avoidance from BlockPainter and DeprecatedPaintLayerPainter. (patchset #2 id:20001 of https://codereview.chromium.org/1297803002/ )

Reason for revert:
Causes FOUC in iframes after the main frame has finished loading.

Original issue's description:
> Remove FOUC avoidance from BlockPainter and DeprecatedPaintLayerPainter.
> 
> After r200515 we no longer start producing frames until the stylesheets
> have loaded which means we will never attempt to paint with pending
> sheets so we don't need the FOUC avoidance code that paints white. Lets
> remove it.
> 
> See: https://src.chromium.org/viewvc/blink?revision=200515&view=revision
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=200587

TBR=bmcquade@chromium.org,chrishtr@chromium.org,pdr@chromium.org,ojan@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/1287113006

git-svn-id: svn://svn.chromium.org/blink/trunk@200731 bbb929c8-8fbe-4397-9dbb-9b2b20218538
10 files changed
tree: 2c308f55aaf894f3b85f2c900a4c4d12b0f49324
  1. third_party/