Revert of Revert of Revert of Revert of Enable display list 2D canvas by default

Revert of Revert of Revert of Revert of Enable display list 2D canvas by default (patchset #1 id:1 of https://codereview.chromium.org/806503003/)

Reason for revert:
Undoing revert because the reason for reverting was resolved by http://src.chromium.org/viewvc/blink?view=rev&rev=188069

Original issue's description:
> Revert of Revert of Revert of Enable display list 2D canvas by default (patchset #1 id:1 of https://codereview.chromium.org/837123003/)
>
> Reason for revert:
> Reverting because this seems to have broken the Win XP Perf bot: https://build.chromium.org/p/chromium.perf/builders/Win%20XP%20Perf%20%281%29/
>
> BUG=446915
>
> Original issue's description:
> > Revert of Revert of Enable display list 2D canvas by default (patchset #1 id:1 of https://codereview.chromium.org/832083003/)
> >
> > Reason for revert:
> > Reverting did not solve the Win XP failures.
> >
> > Original issue's description:
> > > Revert of Enable display list 2D canvas by default (patchset #1 id:1 of https://codereview.chromium.org/818443002/)
> > >
> > > Reason for revert:
> > > WebKit XP bot has lots of LayoutTest failures and crashes in virtual/display_list_2d_canvas and virtual/gpu/fast/canvas.
> > >
> > > See eg:
> > > http://build.chromium.org/p/chromium.webkit/builders/WebKit%20XP/builds/16116
> > >
> > > The commit log suggests --dump-render-tree is
> > > not affected by this change, but I don't see
> > > another likely culprit (unless https://src.chromium.org/viewvc/blink?view=rev&revision=187932)
> > >
> > > The failures started on:
> > > http://build.chromium.org/p/chromium.webkit/builders/WebKit%20XP/builds/16113
> > >
> > > Chrome revision range:
> > > https://chromium.googlesource.com/chromium/src/+log/5b35ed504ba27664bc0b7d7320f2ebdf610decdc..3a5e72899629e0c8d254109707e747742686fbca
> > >
> > > Blink revision range:
> > > http://build.chromium.org/f/chromium/perf/dashboard/ui/changelog_blink.html?url=%2Ftrunk&range=187921%3A187936&mode=html
> > >
> > > Original issue's description:
> > > > Enable display list 2D canvas by default
> > > >
> > > > With this change, display list 2D canvas will become enabled by
> > > > default in Chrome. Content shell with --dump-render-tree will
> > > > continue to have display lists disabled by default.
> > > > Currently, having display lists enabled in blink means
> > > > that display lists will be used whenever 2d canvases would
> > > > not be GPU-accelerated.
> > > >
> > > > BUG=386601
> > > >
> > > > Committed: https://crrev.com/1546f423005338aac5961415bbfc48c61dc183ae
> > > > Cr-Commit-Position: refs/heads/master@{#309453}
> > >
> > > TBR=avi@chromium.org,junov@chromium.org
> > > NOTREECHECKS=true
> > > NOTRY=true
> > > BUG=386601
> > >
> > > Committed: https://crrev.com/b314d341e5c60c03aa118e96318d54a84f00b053
> > > Cr-Commit-Position: refs/heads/master@{#310252}
> >
> > TBR=avi@chromium.org,junov@chromium.org
> > NOTREECHECKS=true
> > NOTRY=true
> > BUG=386601
> >
> > Committed: https://crrev.com/b95bb640426d6e875421462efd6715f4a10488b1
> > Cr-Commit-Position: refs/heads/master@{#310265}
>
> TBR=avi@chromium.org,junov@chromium.org,falken@chromium.org
> NOTREECHECKS=true
> NOTRY=true
> BUG=386601
>
> Committed: https://crrev.com/332a67f090516a637f242c60a0c8f784c4192b18
> Cr-Commit-Position: refs/heads/master@{#310501}

TBR=avi@chromium.org,falken@chromium.org,rmcilroy@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=446915
Committed: https://crrev.com/871e9da86664a56ac7ab5530389c33844f112230
Cr-Commit-Position: refs/heads/master@{#310585}

[Justin Novosad, 2015-01-08 20:16:07]

Created Revert of Revert of Revert of Revert of Enable display list 2D canvas by
default

[commit-bot: I haz the power, 2015-01-08 20:17:32]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/801443005/1

[commit-bot: I haz the power, 2015-01-08 20:19:42]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-01-08 20:21:32]

Patchset 1 (id:??) landed as
https://crrev.com/871e9da86664a56ac7ab5530389c33844f112230
Cr-Commit-Position: refs/heads/master@{#310585}