Disable parallelization on telemetry_unittests & set the number of shards to 2 (linux)

testing/buildbot/chromium.linux.json

Index: testing/buildbot/chromium.linux.json
diff --git a/testing/buildbot/chromium.linux.json b/testing/buildbot/chromium.linux.json
index e71cdc851245ec4180c8708294f5e4676e54e6ac..d07840bcfbc6b2113e6b8ab673d22407434baf9c 100644
--- a/testing/buildbot/chromium.linux.json
+++ b/testing/buildbot/chromium.linux.json
@@ -3243,13 +3243,17 @@
         }
       },
       {
+        "args": [
+          "--jobs=1"
+        ],
         "isolate_name": "telemetry_unittests",
         "name": "telemetry_unittests",
         "override_compile_targets": [
           "telemetry_unittests_run"
         ],
         "swarming": {
-          "can_use_on_swarming_builders": true
+          "can_use_on_swarming_builders": true,
+          "shards": 2
         }
       }
     ],
@@ -3798,13 +3802,17 @@
         }
       },
       {
+        "args": [
+          "--jobs=1"
+        ],
         "isolate_name": "telemetry_unittests",
         "name": "telemetry_unittests",
         "override_compile_targets": [
           "telemetry_unittests_run"
         ],
         "swarming": {
-          "can_use_on_swarming_builders": true
+          "can_use_on_swarming_builders": true,
+          "shards": 2
         }
       }
     ],
@@ -4159,13 +4167,17 @@
         }
       },
       {
+        "args": [
+          "--jobs=1"
+        ],
         "isolate_name": "telemetry_unittests",
         "name": "telemetry_unittests",
         "override_compile_targets": [
           "telemetry_unittests_run"
         ],
         "swarming": {
-          "can_use_on_swarming_builders": true
+          "can_use_on_swarming_builders": true,
+          "shards": 2
         }
       }
     ]