Simulate interactivity boost for simulated user input events

telemetry/telemetry/internal/actions/action_runner.py

Index: telemetry/telemetry/internal/actions/action_runner.py
diff --git a/telemetry/telemetry/internal/actions/action_runner.py b/telemetry/telemetry/internal/actions/action_runner.py
index ec2a5eac8e28db8da31ed2c215a0baed16a7f38d..cfceb44bf302bd2f2acbd9d54a1eebec3db1a23c 100644
--- a/telemetry/telemetry/internal/actions/action_runner.py
+++ b/telemetry/telemetry/internal/actions/action_runner.py
@@ -52,8 +52,14 @@ class ActionRunner(object):
     return self._tab
 
   def _RunAction(self, action):
-    action.WillRunAction(self._tab)
-    action.RunAction(self._tab)
+    try:
+      if action.SimulatesUserInput():
+        self._tab.browser.SetInteractivityBoost(True)
+      action.WillRunAction(self._tab)
+      action.RunAction(self._tab)
+    finally:
+      if action.SimulatesUserInput():
+        self._tab.browser.SetInteractivityBoost(False)
 
   def CreateInteraction(self, label, repeatable=False):
     """ Create an action.Interaction object that issues interaction record.