Bump telemetry_unittests to 100% experiment on cros VM CQ bot.

Hopefully after crrev.com/i/701289 there's enough capacity this time.

TBR=jbudorick, achuith

Bug: 876494
Change-Id: I10e8fa31851c8ebd5f38bb233d66c5b0b47bbf29
Reviewed-on: https://chromium-review.googlesource.com/c/1291709Reviewed-by: Ben Pastene <bpastene@chromium.org>
Commit-Queue: Ben Pastene <bpastene@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601223}

testing/buildbot/chromium.chromiumos.json

@@ -391,7 +391,7 @@
           "--remote=127.0.0.1",
           "--remote-ssh-port=9222"
         ],
-        "experiment_percentage": 50,
+        "experiment_percentage": 100,
         "isolate_name": "telemetry_unittests",
         "name": "telemetry_unittests",
         "swarming": {

testing/buildbot/test_suites.pyl

@@ -480,7 +480,7 @@
           '--remote-ssh-port=9222',
         ],
         # TODO(crbug.com/876494): Move this out of experimental.
-        'experiment_percentage': 50,
+        'experiment_percentage': 100,
         'swarming': {
           'hard_timeout': 1200,
           'idempotent': False,  # https://crbug.com/549140