[V8] Reland https://codereview.chromium.org/1100993003/

[V8] Reland https://codereview.chromium.org/1100993003/

Chromium tests were prepared in https://codereview.chromium.org/1118743003/
Blink tests in https://codereview.chromium.org/1115193002/

LOG=Y
BUG=chromium:480652
R=yangguo@chromium.org

Committed: https://crrev.com/19b62e211d1829108e5c85c5043dd755afa17178
Cr-Commit-Position: refs/heads/master@{#28229}

[kozy, 2015-05-05 10:30:48]

Yang, please take a look.

[Yang, 2015-05-05 10:58:21]

lgtm

[kozy, 2015-05-05 14:18:45]

The CQ bit was checked by kozyatinskiy@chromium.org

[commit-bot: I haz the power, 2015-05-05 14:19:05]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1121833003/1

[commit-bot: I haz the power, 2015-05-05 14:21:12]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-05-05 14:21:23]

Patchset 1 (id:??) landed as
https://crrev.com/19b62e211d1829108e5c85c5043dd755afa17178
Cr-Commit-Position: refs/heads/master@{#28229}

[Michael Achenbach, 2015-05-06 06:59:24]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/1125113003/ by machenbach@chromium.org.

The reason for reverting is: [Sheriff] Speculative revert for breaking layout
tests - will reland if it doesn't help:
http://build.chromium.org/p/client.v8/builders/V8-Blink%20Linux%2064/builds/3178.

[Michael Achenbach, 2015-05-06 08:31:25]

The revert helped. Please land a blink-side NeedsManualRebaseline expectation
change first before relanding, if the change was intended.

[Michael Achenbach, 2015-05-06 09:58:57]

Hmm - I can see that there was an expectation change already. I'll investigate
why it is ignored.

[Michael Achenbach, 2015-05-06 10:00:29]

The layout test expectation changes miss one test:
virtual/slimmingpaint/svg/dom/SVGViewSpec.html

[Michael Achenbach, 2015-05-06 10:27:45]

This also breaks Threading2 on arm debug without vfp3:
http://build.chromium.org/p/client.v8/builders/V8%20Linux%20-%20arm%20-%20sim...

The root cause might be somewhere else, but please investigate before relanding.