Add experimental, non-snapshotted V8 extras

Add experimental, non-snapshotted V8 extras

Embedders would use these for features which must be able to be turned
off at runtime, despite being compiled into V8. They can be turned on
and off by the embedder using the --experimental_extras flag, e.g. via
v8::SetFlagsFromString.

R=yangguo@chromium.org, mlippautz@chromium.org, hpayer@chromium.org
BUG=chromium:507137
LOG=Y

Committed: https://crrev.com/6f582f088aec1b727fce3c87b89e38d2c25ab468
Cr-Commit-Position: refs/heads/master@{#30260}

[domenic, 2015-08-12 21:47:03]

Depends on previous CL https://codereview.chromium.org/1289603002

[Yang, 2015-08-13 12:35:31]

LGTM, but it would be very nice if we had a test case for experimental extras as
well.

[domenic, 2015-08-13 18:32:46]

The CQ bit was checked by domenic@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2015-08-13 18:33:05]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1284413002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1284413002/20001

[commit-bot: I haz the power, 2015-08-13 18:33:48]

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

[commit-bot: I haz the power, 2015-08-13 18:33:49]

Dry run: Try jobs failed on following builders:
  v8_linux64_asan_rel on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux64_asan_rel/builds/...)
  v8_linux_gcc_compile_rel on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux_gcc_compile_rel/bu...)

[domenic, 2015-08-13 18:35:43]

On 2015/08/13 at 12:35:31, yangguo wrote:
> LGTM, but it would be very nice if we had a test case for experimental extras
as well.

Test added. Looks like it won't let me run tryjobs until the previous patch
lands though.

[Yang, 2015-08-14 07:53:33]

On 2015/08/13 18:35:43, domenic wrote:
> On 2015/08/13 at 12:35:31, yangguo wrote:
> > LGTM, but it would be very nice if we had a test case for experimental
extras
> as well.
> 
> Test added. Looks like it won't let me run tryjobs until the previous patch
> lands though.

still lgtm.

[domenic, 2015-08-14 19:25:29]

The CQ bit was checked by domenic@chromium.org

[domenic, 2015-08-14 19:25:30]

The patchset sent to the CQ was uploaded after l-g-t-m from yangguo@chromium.org
Link to the patchset: https://codereview.chromium.org/1284413002/#ps40001
(title: "rebase")

[commit-bot: I haz the power, 2015-08-14 19:25:48]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1284413002/40001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1284413002/40001

[commit-bot: I haz the power, 2015-08-14 19:28:17]

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

[commit-bot: I haz the power, 2015-08-14 19:28:17]

Try jobs failed on following builders:
  v8_linux64_avx2_rel on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux64_avx2_rel/builds/...)
  v8_linux_rel on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux_rel/builds/8572)
  v8_mac_rel on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_mac_rel/builds/8688)

[domenic, 2015-08-14 19:33:57]

On 2015/08/14 at 19:28:17, commit-bot wrote:
> Try jobs failed on following builders:
>   v8_linux64_avx2_rel on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux64_avx2_rel/builds/...)
>   v8_linux_rel on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux_rel/builds/8572)
>   v8_mac_rel on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_mac_rel/builds/8688)

** Presubmit ERRORS **
Missing LGTM from an OWNER for these files:
    src/heap/heap.cc
    src/heap/heap.h

Sorry Yang apparently you are not an owner for heap.h/heap.cc... how is this
supposed to work?

[Yang, 2015-08-14 19:52:32]

On 2015/08/14 19:33:57, domenic wrote:
> On 2015/08/14 at 19:28:17, commit-bot wrote:
> > Try jobs failed on following builders:
> >   v8_linux64_avx2_rel on tryserver.v8 (JOB_FAILED,
>
http://build.chromium.org/p/tryserver.v8/builders/v8_linux64_avx2_rel/builds/...)
> >   v8_linux_rel on tryserver.v8 (JOB_FAILED,
> http://build.chromium.org/p/tryserver.v8/builders/v8_linux_rel/builds/8572)
> >   v8_mac_rel on tryserver.v8 (JOB_FAILED,
> http://build.chromium.org/p/tryserver.v8/builders/v8_mac_rel/builds/8688)
> 
> ** Presubmit ERRORS **
> Missing LGTM from an OWNER for these files:
>     src/heap/heap.cc
>     src/heap/heap.h
> 
> Sorry Yang apparently you are not an owner for heap.h/heap.cc... how is this
> supposed to work?

please add hpayer or mlippautz as reviewer as well

[Yang, 2015-08-17 07:06:21]

yangguo@chromium.org changed reviewers:
+ hpayer@chromium.org, mlippautz@chromium.org

[Yang, 2015-08-17 07:06:22]

Hannes or Michael, could one of you review the heap changes?

[Michael Lippautz, 2015-08-17 08:32:42]

heap lgtm

[Hannes Payer (out of office), 2015-08-17 09:45:58]

lgtm after fixing build error.
Moreover, set BUG= to BUG=chromium:507137

[domenic, 2015-08-17 15:58:17]

The CQ bit was checked by domenic@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2015-08-17 15:58:23]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1284413002/60001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1284413002/60001

[commit-bot: I haz the power, 2015-08-17 16:02:07]

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

[commit-bot: I haz the power, 2015-08-17 16:02:07]

Dry run: Try jobs failed on following builders:
  v8_linux64_rel on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux64_rel/builds/8694)

[domenic, 2015-08-17 18:14:35]

The CQ bit was checked by domenic@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2015-08-17 18:14:47]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1284413002/80001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1284413002/80001

[commit-bot: I haz the power, 2015-08-17 18:18:34]

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

[commit-bot: I haz the power, 2015-08-17 18:18:35]

Dry run: Try jobs failed on following builders:
  v8_mac_rel on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_mac_rel/builds/8730)

[domenic, 2015-08-17 18:24:56]

The CQ bit was checked by domenic@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2015-08-17 18:25:03]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1284413002/100001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1284413002/100001

[commit-bot: I haz the power, 2015-08-17 18:33:26]

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

[commit-bot: I haz the power, 2015-08-17 18:33:27]

Dry run: Try jobs failed on following builders:
  v8_mac_rel on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_mac_rel/builds/8735)

[domenic, 2015-08-17 19:47:42]

The CQ bit was checked by domenic@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2015-08-17 19:47:54]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1284413002/160001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1284413002/160001

[commit-bot: I haz the power, 2015-08-17 19:53:28]

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

[commit-bot: I haz the power, 2015-08-17 19:53:28]

Dry run: Try jobs failed on following builders:
  v8_linux_chromium_gn_rel on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux_chromium_gn_rel/bu...)

[domenic, 2015-08-17 20:58:36]

Thanks all for the help. The external snapshot change this morning made fixing
the build error hairier than I expected, and
https://codereview.chromium.org/1298003004 in chromium needs to land first to
make the gn build pass, but we should be good to go after that happens.

[domenic, 2015-08-19 20:19:39]

The CQ bit was checked by domenic@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2015-08-19 20:19:51]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1284413002/180001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1284413002/180001

[commit-bot: I haz the power, 2015-08-19 20:25:47]

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

[commit-bot: I haz the power, 2015-08-19 20:25:48]

Dry run: Try jobs failed on following builders:
  v8_linux_chromium_gn_rel on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux_chromium_gn_rel/bu...)

[domenic, 2015-08-19 22:59:53]

The CQ bit was checked by domenic@chromium.org

[domenic, 2015-08-19 22:59:53]

The patchset sent to the CQ was uploaded after l-g-t-m from hpayer@chromium.org,
mlippautz@chromium.org, yangguo@chromium.org
Link to the patchset: https://codereview.chromium.org/1284413002/#ps200001
(title: "Missing gn entries")

[commit-bot: I haz the power, 2015-08-19 23:00:08]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1284413002/200001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1284413002/200001

[commit-bot: I haz the power, 2015-08-20 00:01:12]

Committed patchset #11 (id:200001)

[commit-bot: I haz the power, 2015-08-20 00:01:21]

Patchset 11 (id:??) landed as
https://crrev.com/6f582f088aec1b727fce3c87b89e38d2c25ab468
Cr-Commit-Position: refs/heads/master@{#30260}