Enable display list 2D canvas by default

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}

[Justin Novosad, 2014-12-18 18:20:33]

junov@chromium.org changed reviewers:
+ avi@chromium.org

[Justin Novosad, 2014-12-18 18:20:34]

PTAL

[Avi (use Gerrit), 2014-12-18 19:42:21]

lgtm

[Justin Novosad, 2014-12-18 19:48:11]

The CQ bit was checked by junov@chromium.org

[commit-bot: I haz the power, 2014-12-18 20:02:24]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/818443002/1

[commit-bot: I haz the power, 2014-12-18 20:57:01]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-12-18 20:58:02]

Patchset 1 (id:??) landed as
https://crrev.com/f98a302c6231cd607bb64eeadc5233ca858e3e8e
Cr-Commit-Position: refs/heads/master@{#309069}

[fmeawad, 2014-12-19 00:51:27]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/814163002/ by fmeawad@chromium.org.

The reason for reverting is: Speculative revert.

Causing blink_perf.canvas to fail on Linux and Mac

http://build.chromium.org/p/chromium.perf/builders/Mac%2010.8%20Perf%20%281%2...
http://build.chromium.org/p/chromium.perf/builders/Linux%20Perf%20%281%29/bui....

[Justin Novosad, 2014-12-22 20:25:05]

blink_perf.canvas test was fixed in Blink to make it compatible with
asynchronous rendering. This change can now be re-landed.

[Justin Novosad, 2014-12-22 20:25:09]

The CQ bit was checked by junov@chromium.org

[commit-bot: I haz the power, 2014-12-22 20:26:09]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/818443002/1

[commit-bot: I haz the power, 2014-12-22 20:27:40]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-12-22 20:28:31]

Patchset 1 (id:??) landed as
https://crrev.com/1546f423005338aac5961415bbfc48c61dc183ae
Cr-Commit-Position: refs/heads/master@{#309453}

[pfeldman, 2014-12-24 15:30:04]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/824063002/ by pfeldman@chromium.org.

The reason for reverting is: Breaks devtools highlight on hidpi screens. See
crbug.com/445051..

[falken, 2015-01-07 08:36:17]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/832083003/ by falken@chromium.org.

The reason for reverting is: 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/5b35ed504ba27664bc0b7d732...

Blink revision range:
http://build.chromium.org/f/chromium/perf/dashboard/ui/changelog_blink.html?u....