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This script takes in multiple Swarming dimension sets, specified as a
JSON string which decodes to a list of dictionaries. The script queries
the Swarming pool for the live bots for each dimension and spreads the
shard(s) for the given tests across them according to an algorithm
defined in the script.

This allows two or more GPU configurations to be specified for a single
bot. This way, during upgrades of the fleet, jobs can temporarily be
targeted at both the old and the new configurations, avoiding
temporarily losing half of the capacity.

The trigger script is enabled on these four bots:

  chromium.gpu:Win7 Release (NVIDIA)
  chromium.gpu.fyi:Win7 Release (NVIDIA)
  chromium.gpu.fyi:Win7 dEQP Release (NVIDIA)
  chromium.gpu.fyi:Optional Win7 Release (NVIDIA)

which are mirrored to the following trybots:

  tryserver.chromium.win:win7_chromium_rel_ng
  tryserver.chromium.win:win_optional_gpu_tests_rel
  tryserver.chromium.angle:win_angle_rel_ng
  tryserver.chromium.angle:win_angle_deqp_rel_ng

Once the upgrade to Win10 begins, Win10 will be set as an alternate
Swarming dimension for these bots. When the upgrade is complete, the
bots will be targeted solely at Win10, with Win7 only being tested on
the waterfalls.

BUG=781057

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: Ie79953dfa023c3a9e4427e651ac6f8c10304b74c
Reviewed-on: https://chromium-review.googlesource.com/833505
Commit-Queue: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Stephen Martinis <martiniss@chromium.org>
Cr-Commit-Position: refs/heads/master@{#529170}