chrome OS: Add scheduler configuration field trial testing config.

Bug: 927840
Change-Id: I97ca518d172c0e208b0d8828c2c73d78c0b4523a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1610223Reviewed-by: Steven Holte <holte@chromium.org>
Commit-Queue: Greg Kerr <kerrnel@chromium.org>
Auto-Submit: Greg Kerr <kerrnel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#659249}

testing/variations/fieldtrial_testing_config.json

@@ -4453,6 +4453,24 @@
             ]
         }
     ],
+    "SchedulerConfiguration": [
+        {
+            "platforms": [
+                "chromeos"
+            ],
+            "experiments": [
+                {
+                    "name": "Conservative",
+                    "params": {
+                        "config": "conservative"
+                    },
+                    "enable_features": [
+                        "SchedulerConfiguration"
+                    ]
+                }
+            ]
+        }
+    ],
     "ScriptStreamingOnPreload": [
         {
             "platforms": [