Reland of New PaintController under-invalidation checking (patchset #1 id:1 of https://codereview.chromium.org/2156053002/ )

Reason for revert:
The original CL is to discover such bugs. Will mark the test failure in the reland.

Original issue's description:
> Revert of New PaintController under-invalidation checking (patchset #7 id:120001 of https://codereview.chromium.org/2114653003/ )
>
> Reason for revert:
> NOTREACHED being hit in checkUnderInvalidation on WebKit Win7 (dbg); see https://build.chromium.org/p/chromium.webkit/builders/WebKit%20Win7%20%28dbg%29/builds/6481.
>
> Original issue's description:
> > New PaintController under-invalidation checking
> >
> > This is a follow-up of https://codereview.chromium.org/2107103002/
> > which broke the original under-invalidation checking in
> > PaintController.
> >
> > BUG=596983,510908
> >
> > Committed: https://crrev.com/63b12484f2c59ba177a21aba09b8a4edd38e6ea1
> > Cr-Commit-Position: refs/heads/master@{#405805}
>
> TBR=chrishtr@chromium.org,pdr@chromium.org,wangxianzhu@chromium.org
> # Not skipping CQ checks because original CL landed more than 1 days ago.
> BUG=596983,510908
>
> Committed: https://crrev.com/f2f05c78616f02157cd1414905a8692f227d9a64
> Cr-Commit-Position: refs/heads/master@{#405988}

TBR=chrishtr@chromium.org,pdr@chromium.org,grt@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=596983,510908

Review-Url: https://codereview.chromium.org/2162603002
Cr-Commit-Position: refs/heads/master@{#406016}
7 files changed