Ignore OnKeyEvent for VKEY_POWER because it is handled by PowerButtonEvent

chromeos/dbus/fake_power_manager_client.h

Index: chromeos/dbus/fake_power_manager_client.h
diff --git a/chromeos/dbus/fake_power_manager_client.h b/chromeos/dbus/fake_power_manager_client.h
index 4e569b608d3891ad10eb0a5686e7cd9146743b13..6cd57a5e04063939d1f4e7f4c3795a68c4fe49d4 100644
--- a/chromeos/dbus/fake_power_manager_client.h
+++ b/chromeos/dbus/fake_power_manager_client.h
@@ -39,6 +39,9 @@ class CHROMEOS_EXPORT FakePowerManagerClient : public PowerManagerClient {
   bool have_video_activity_report() const {
     return !video_activity_reports_.empty();
   }
+  int num_set_backlights_forced_off_calls() const {
+    return num_set_backlights_forced_off_calls_;
+  }
 
   // PowerManagerClient overrides
   void Init(dbus::Bus* bus) override;
@@ -111,6 +114,7 @@ class CHROMEOS_EXPORT FakePowerManagerClient : public PowerManagerClient {
   int num_request_shutdown_calls_;
   int num_set_policy_calls_;
   int num_set_is_projecting_calls_;
+  int num_set_backlights_forced_off_calls_;
 
   // Number of pending suspend readiness callbacks.
   int num_pending_suspend_readiness_callbacks_;