Reland "Move telemetry_unittests from cros VM fyi bot to CQ bot."

This is a reland of 7f0c13c7

We've bumped capacity in both the builder pool and tester pool.
Hopefully that'll be enough!

Original change's description:
> Move telemetry_unittests from cros VM fyi bot to CQ bot.
>
> Bug: 876494
> Change-Id: Icfa8631e1278745a50e439d78b4373fb1f0f1f3a
> Reviewed-on: https://chromium-review.googlesource.com/c/1281230
> Reviewed-by: Achuith Bhandarkar <achuith@chromium.org>
> Commit-Queue: Ben Pastene <bpastene@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#599851}

Bug: 876494
Change-Id: Id83dc5f3e0063c130ce7b80b8a72e28b9f72bd83
Reviewed-on: https://chromium-review.googlesource.com/c/1286900Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: Ben Pastene <bpastene@chromium.org>
Cr-Commit-Position: refs/heads/master@{#600527}

testing/buildbot/chromium.chromiumos.json

@@ -385,6 +385,30 @@
           "idempotent": false,
           "shards": 6
         }
+      },
+      {
+        "args": [
+          "--jobs=1",
+          "--browser=cros-chrome",
+          "--remote=127.0.0.1",
+          "--remote-ssh-port=9222"
+        ],
+        "experiment_percentage": 50,
+        "isolate_name": "telemetry_unittests",
+        "name": "telemetry_unittests",
+        "swarming": {
+          "can_use_on_swarming_builders": true,
+          "dimension_sets": [
+            {
+              "kvm": "1",
+              "os": "Ubuntu-14.04",
+              "pool": "Chrome-CrOS-VM"
+            }
+          ],
+          "hard_timeout": 1200,
+          "idempotent": false,
+          "shards": 12
+        }
       }
     ]
   },

testing/buildbot/chromium.fyi.json

@@ -3173,34 +3173,6 @@
         },
         "test": "services_unittests"
       }
-    ],
-    "isolated_scripts": [
-      {
-        "args": [
-          "--jobs=1",
-          "--browser=cros-chrome",
-          "--remote=127.0.0.1",
-          "--remote-ssh-port=9222",
-          "--skip=telemetry.internal.app.android_app_unittest.AndroidAppTest.testWebView",
-          "--skip=telemetry.internal.backends.browser_backend_unittest.BrowserBackendIntegrationTest.testSmokeIsBrowserRunningReturnFalse"
-        ],
-        "isolate_name": "telemetry_unittests",
-        "name": "telemetry_unittests",
-        "swarming": {
-          "can_use_on_swarming_builders": true,
-          "dimension_sets": [
-            {
-              "kvm": "1",
-              "os": "Ubuntu-14.04",
-              "pool": "Chrome-CrOS-VM"
-            }
-          ],
-          "hard_timeout": 3600,
-          "idempotent": false,
-          "io_timeout": 3600,
-          "shards": 12
-        }
-      }
     ]
   },
   "chromeos-kevin-rel-hw-tests": {

testing/buildbot/test_suites.pyl

@@ -473,9 +473,6 @@
           'shards': 6,
         },
       },
-    },
-
-    'chromeos_isolated_scripts_experimental': {
       'telemetry_unittests': {
         'args': [
           '--jobs=1',
@@ -483,10 +480,9 @@
           # By default, CrOS VMs' ssh servers listen on local port 9222.
           '--remote=127.0.0.1',
           '--remote-ssh-port=9222',
-          # Always fails.
-          '--skip=telemetry.internal.app.android_app_unittest.AndroidAppTest.testWebView',
-          '--skip=telemetry.internal.backends.browser_backend_unittest.BrowserBackendIntegrationTest.testSmokeIsBrowserRunningReturnFalse',
         ],
+        # TODO(crbug.com/876494): Move this out of experimental.
+        'experiment_percentage': 50,
         'swarming': {
           'hard_timeout': 1200,
           'idempotent': False,  # https://crbug.com/549140

testing/buildbot/waterfalls.pyl

@@ -1247,7 +1247,6 @@
         ],
         'test_suites': {
           'gtest_tests': 'chromeos_gtests_experimental',
-          'isolated_scripts': 'chromeos_isolated_scripts_experimental',
         },
         'swarming': {
           'dimension_sets': [