[swarming] Isolate v8 testing.

[swarming] Isolate v8 testing.

Add gyp support and isolates for default test suites.
Add two default isolates, one (default) for using the
test suite collection we call "default" on the bots. One
(developer_default) for also supporting the way developers
call the driver (i.e. without argument, which includes
the unittests).

BUG=chromium:535160
LOG=n

Committed: https://crrev.com/9bd83f58f29ab0c7c5b71b00bcb1df3a9e641f05
Cr-Commit-Position: refs/heads/master@{#31081}

[Michael Achenbach, 2015-10-02 12:18:52]

machenbach@chromium.org changed reviewers:
+ jochen@chromium.org, tandrii@chromium.org

[Michael Achenbach, 2015-10-02 12:24:56]

PTAL. tandrii for isolate stuff, jochen for v8-specific stuff

Tested locally with:
GYP_GENERATORS=ninja GYP_DEFINES="target_arch=x64 v8_target_arch=x64
test_isolation_mode=check" gclient runhooks
ninja -C out/Release developer_default_run
path/to/isolate.py run -s path/to/v8/out/Release/developer_default.isolated --
--buildbot --arch=x64 --mode=Release

Also tested remotely with:
GYP_GENERATORS=ninja GYP_DEFINES="target_arch=x64 v8_target_arch=x64
test_isolation_mode=prepare" gclient runhooks
path/to/isolate.py batcharchive path/to/v8/out/Release/default.isolated.gen.json
--isolate-server https://isolateserver.appspot.com
path/to/swarming.py run -I isolateserver.appspot.com -S
chromium-swarm.appspot.com -d os Ubuntu-12.04 -d gpu none --verbose
path/to/v8/out/Release/default.isolated -- --buildbot default --arch=x64
--mode=Release --progress=verbose

Resulting in:
https://chromium-swarm.appspot.com/user/task/2a40bb606297c810

[M-A Ruel, 2015-10-02 12:34:15]

maruel@chromium.org changed reviewers:
+ maruel@chromium.org

[M-A Ruel, 2015-10-02 12:34:16]

rubberstamp lgtm

[Michael Achenbach, 2015-10-02 12:51:58]

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

[commit-bot: I haz the power, 2015-10-02 12:52:13]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1380593002/120001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1380593002/120001

[commit-bot: I haz the power, 2015-10-02 12:55:38]

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

[commit-bot: I haz the power, 2015-10-02 12:55:39]

Dry run: Try jobs failed on following builders:
  v8_android_arm_compile_rel on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_android_arm_compile_rel/...)

[Michael Achenbach, 2015-10-02 13:06:11]

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

[commit-bot: I haz the power, 2015-10-02 13:06:29]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1380593002/140001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1380593002/140001

[commit-bot: I haz the power, 2015-10-02 13:40:44]

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

[commit-bot: I haz the power, 2015-10-02 13:40:47]

Dry run: This issue passed the CQ dry run.

[Michael Achenbach, 2015-10-02 15:06:26]

The CQ bit was checked by machenbach@chromium.org

[Michael Achenbach, 2015-10-02 15:06:27]

The patchset sent to the CQ was uploaded after l-g-t-m from maruel@chromium.org
Link to the patchset: https://codereview.chromium.org/1380593002/#ps140001
(title: "Make dependencies conditional.")

[commit-bot: I haz the power, 2015-10-02 15:06:38]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1380593002/140001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1380593002/140001

[commit-bot: I haz the power, 2015-10-02 15:15:35]

Committed patchset #8 (id:140001)

[commit-bot: I haz the power, 2015-10-02 15:15:46]

Patchset 8 (id:??) landed as
https://crrev.com/9bd83f58f29ab0c7c5b71b00bcb1df3a9e641f05
Cr-Commit-Position: refs/heads/master@{#31081}

[danno, 2015-10-02 15:44:34]

A revert of this CL (patchset #8 id:140001) has been created in
https://codereview.chromium.org/1370993008/ by danno@chromium.org.

The reason for reverting is: Prime suspect in breakage of V8 Linux -- no snap.

[danno, 2015-10-02 15:45:58]

A revert of this CL (patchset #8 id:140001) has been created in
https://codereview.chromium.org/1386663002/ by danno@chromium.org.

The reason for reverting is: Prime suspect for breaking Linux V8 - no snap.