Reland Update Linux Viz telemetry timeouts

Originally reviewed: https://chromium-review.googlesource.com/c/chromium/src/+/1168546
Reverted due to the great Gerrit tree closure of 2018:
https://chromium-review.googlesource.com/c/chromium/src/+/1169793

TBR=thakis@chromium.org

Update Linux Viz telemetry timeouts

We occassionally see telemetry_unittests_viz and telemetry_perf_unittests_viz
timeout on the FYI Linux Viz bot.

The logs point to no specific test taking longer than on a normal run. Nor of
any test hanging. The bot also reports 22/22 done on the shard, and browser
teardown, but never compiles the final success tally.

We would like to speculatively increase the timeouts here to see if that
stabilizes the bot.

TEST=telemetry_unittests_viz and telemetry_perf_unittests_viz

Bug: 871751
Change-Id: I4a3da0e45e5006673a5a3967e9e33d602d38794e
Reviewed-on: https://chromium-review.googlesource.com/1168546Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/1170092Reviewed-by: Jonathan Ross <jonross@chromium.org>
Commit-Queue: Jonathan Ross <jonross@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582161}

testing/buildbot/chromium.fyi.json

@@ -1036,7 +1036,7 @@
         "name": "telemetry_perf_unittests",
         "swarming": {
           "can_use_on_swarming_builders": true,
-          "hard_timeout": 960,
+          "hard_timeout": 1200,
           "idempotent": false,
           "shards": 12
         }
@@ -1050,7 +1050,7 @@
         "name": "telemetry_perf_unittests_viz",
         "swarming": {
           "can_use_on_swarming_builders": true,
-          "hard_timeout": 960,
+          "hard_timeout": 1200,
           "idempotent": false,
           "shards": 12
         }

testing/buildbot/test_suites.pyl

@@ -1651,7 +1651,7 @@
         '--xvfb',
       ],
       'swarming': {
-        'hard_timeout': 960,
+        'hard_timeout': 1200,
         'idempotent': False,  # https://crbug.com/549140
         'shards': 12,
       },
@@ -1663,7 +1663,7 @@
         '--extra-browser-args=--enable-features=VizDisplayCompositor',
       ],
       'swarming': {
-        'hard_timeout': 960,
+        'hard_timeout': 1200,
         'idempotent': False,  # https://crbug.com/549140
         'shards': 12,
       },