Add support for new-ish V8 use counters

Add support for new-ish V8 use counters

R=jochen@chromium.org
BUG=

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=195119

[jochen (gone - plz use gerrit), 2015-05-08 10:40:24]

lgtm

[Erik Corry Chromium.org, 2015-05-08 11:01:17]

The CQ bit was checked by erikcorry@chromium.org

[commit-bot: I haz the power, 2015-05-08 11:01:43]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1135753002/1

[commit-bot: I haz the power, 2015-05-08 11:05:05]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-05-08 11:05:06]

Try jobs failed on following builders:
  mac_blink_compile_dbg on tryserver.blink (JOB_FAILED,
http://build.chromium.org/p/tryserver.blink/builders/mac_blink_compile_dbg/bu...)

[Erik Corry Chromium.org, 2015-05-08 11:34:17]

The CQ bit was checked by erikcorry@chromium.org

[Erik Corry Chromium.org, 2015-05-08 11:34:17]

The patchset sent to the CQ was uploaded after l-g-t-m from jochen@chromium.org
Link to the patchset: https://codereview.chromium.org/1135753002/#ps20001
(title: "Fix merge")

[commit-bot: I haz the power, 2015-05-08 11:34:24]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1135753002/20001

[commit-bot: I haz the power, 2015-05-08 15:54:08]

Committed patchset #2 (id:20001) as
https://src.chromium.org/viewvc/blink?view=rev&revision=195119

[haraken, 2015-05-08 23:24:07]

LGTM

[sof, 2015-05-09 14:01:10]

A revert of this CL (patchset #2 id:20001) has been created in
https://codereview.chromium.org/1131413002/ by sigbjornf@opera.com.

The reason for reverting is: The v8 use counters now being handled are reported
over an Isolate for which callingExecutionContext() fails --

 
https://storage.googleapis.com/chromium-layout-test-archives/WebKit_Mac_Oilpa...

(first build on Mac Oilpan(dbg) with the new crashes.).