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Add filters for flaking webgl_conformance tests.
Add maps tests to Fuchsia x64 CI bot. Increases bot time per run by ~4 minutes.

Bug: 1133540
Change-Id: Ic064b2a7608e0bbf97c02163908c9264c906d737
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2493783
Auto-Submit: Chong Gu <chonggu@google.com>
Reviewed-by: Brian Sheedy <bsheedy@chromium.org>
Commit-Queue: Chong Gu <chonggu@google.com>
Cr-Commit-Position: refs/heads/master@{#820118}