GitLab

* Disable POSIX signalling from BrowserTestBase for Fuchsia
  (not compatible).
* Switch EXPECT_DEATH tests to EXPECT_DEATH_IF_SUPPORTED for
  TestBrowserThreadBundleTest.
* Add fuchsia to the list of supported platforms in
  fieldtrial_to_struct.py.
* Move webrtc deps into "enable_webrtc" conditional block.


Bug: 754861, 756269
Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: I2cce36ca3cebfeb0acf86ad0c2cf0cd0f8645f51
Reviewed-on: https://chromium-review.googlesource.com/619727
Commit-Queue: Kevin Marshall <kmarshall@chromium.org>
Reviewed-by: Scott Graham <scottmg@chromium.org>
Reviewed-by: Nasko Oskov <nasko@chromium.org>
Reviewed-by: Alexei Svitkine (very slow) <asvitkine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#496498}