[scheduler] Disable scheduling input heuristics on waterfall.

BUG=874836
R=rkaplow@chromium.org

Change-Id: Icf5c0b87a82dd8a9da5af02411727c103e4494b8
Reviewed-on: https://chromium-review.googlesource.com/c/1259662Reviewed-by: Robert Kaplow (sloooow) <rkaplow@chromium.org>
Commit-Queue: Alexander Timin <altimin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#599639}

testing/variations/fieldtrial_testing_config.json

@@ -985,6 +985,27 @@
             ]
         }
     ],
+    "BlinkSchedulerRemoveInputUseCaseHeuristics": [
+        {
+            "platforms": [
+                "android",
+                "chromeos",
+                "ios",
+                "linux",
+                "mac",
+                "windows"
+            ],
+            "experiments": [
+                {
+                    "name": "NoAllHeuristics",
+                    "enable_features": [
+                        "BlinkSchedulerDisableNonTouchstartInputHeuristics",
+                        "BlinkSchedulerDisableTouchstartInputHeuristics"
+                    ]
+                }
+            ]
+        }
+    ],
     "BlobDataPipeTuning": [
         {
             "platforms": [