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

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}

[falken, 2015-01-07 10:55:44]

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

[commit-bot: I haz the power, 2015-01-07 10:56:17]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/837123003/1

[commit-bot: I haz the power, 2015-01-07 10:56:52]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-01-07 10:58:05]

Patchset 1 (id:??) landed as
https://crrev.com/b95bb640426d6e875421462efd6715f4a10488b1
Cr-Commit-Position: refs/heads/master@{#310265}

[rmcilroy, 2015-01-08 14:44:36]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/806503003/ by rmcilroy@chromium.org.

The reason for reverting is: 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.