Add angle_end2end_tests target and isolate.

Add angle_end2end_tests target and isolate.

It's not feasible to reference ANGLE's test targets directly because
Chromium must use base's test launcher and ANGLE may not refer to it.

This new target and angle_unittests have been refactored in terms of
.gypi files provided by the ANGLE workspace, allowing both workspaces
to build these targets, though their main.cpp files differ.

BUG=435726
Committed: https://crrev.com/db69c444f63013597dca063a3256ae37c7f539c9
Cr-Commit-Position: refs/heads/master@{#309366}

[Ken Russell (switch to Gerrit), 2014-12-16 01:36:14]

kbr@chromium.org changed reviewers:
+ bajones@chromium.org, geofflang@chromium.org, jmadill@chromium.org,
piman@chromium.org, sievers@chromium.org, zmo@chromium.org

[Ken Russell (switch to Gerrit), 2014-12-16 01:36:14]

(geofflang or jmadill) and (bajones or zmo): please review.
(piman or sievers): OWNERS review please.

This new target will make it possible to run more of ANGLE's tests on the GPU
bots.

Verified by building and running the new isolate. Will add it to the GPU recipe
for the FYI bots once this lands.

I attempted to port the GYP changes to the GN build, but more work is needed in
ANGLE's GN files first. Will do this in follow-on CLs.

[Ken Russell (switch to Gerrit), 2014-12-16 01:38:27]

kbr@chromium.org changed reviewers:
+ csharp@chromium.org, maruel@chromium.org

[Ken Russell (switch to Gerrit), 2014-12-16 01:38:27]

(csharp or maruel): OWNERS review of the new isolate please. Thanks.

[M-A Ruel, 2014-12-16 01:44:01]

lgtm

[piman, 2014-12-16 02:37:03]

lgtm

[Geoff Lang, 2014-12-16 20:18:06]

lgtm

[bajones, 2014-12-16 22:06:20]

lgtm

[Ken Russell (switch to Gerrit), 2014-12-19 00:32:18]

No re-review necessary, but any comments welcome.

This now depends on https://chromium-review.googlesource.com/236681 . Once that
lands in ANGLE and ANGLE rolls in to Chromium, this can land. It's now possible
to build these angle_unittests and angle_end2end_tests targets in both the
Chromium and ANGLE workspaces.

[Ken Russell (switch to Gerrit), 2014-12-20 00:05:32]

The CQ bit was checked by kbr@chromium.org

[commit-bot: I haz the power, 2014-12-20 00:06:09]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/807753002/100001

[commit-bot: I haz the power, 2014-12-20 00:14:21]

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

[commit-bot: I haz the power, 2014-12-20 00:14:21]

Try jobs failed on following builders:
  android_compile_rel on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/android_compile...)

[Ken Russell (switch to Gerrit), 2014-12-20 01:30:33]

The CQ bit was checked by kbr@chromium.org

[commit-bot: I haz the power, 2014-12-20 01:31:04]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/807753002/120001

[commit-bot: I haz the power, 2014-12-20 02:36:46]

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

[commit-bot: I haz the power, 2014-12-20 02:36:47]

Try jobs failed on following builders:
  win_chromium_compile_dbg on tryserver.chromium.win
(http://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_comp...)

[Ken Russell (switch to Gerrit), 2014-12-20 22:38:41]

The CQ bit was checked by kbr@chromium.org

[commit-bot: I haz the power, 2014-12-20 22:39:19]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/807753002/140001

[commit-bot: I haz the power, 2014-12-20 23:39:14]

Committed patchset #8 (id:140001)

[commit-bot: I haz the power, 2014-12-20 23:39:50]

Patchset 8 (id:??) landed as
https://crrev.com/db69c444f63013597dca063a3256ae37c7f539c9
Cr-Commit-Position: refs/heads/master@{#309366}