cros: Stop forcing off display when lid events are received

ash/system/power/tablet_power_button_controller_unittest.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/system/power/tablet_power_button_controller.h"
 
 #include <memory>
 
 #include "ash/ash_switches.h"
 #include "ash/public/cpp/config.h"
@@ skipping 466 matching lines @@
   EXPECT_FALSE(GetBacklightsForcedOff());
 
   // Test that after another long duration, backlights should be forced off.
   tick_clock_->Advance(base::TimeDelta::FromMilliseconds(800));
   power_manager_client_->SendPowerButtonEvent(true, tick_clock_->NowTicks());
   power_manager_client_->SendPowerButtonEvent(false, tick_clock_->NowTicks());
   power_manager_client_->SendBrightnessChanged(0, false);
   EXPECT_TRUE(GetBacklightsForcedOff());
 }
 
+// Tests that lid closed/open events stop forcing off backlights.
+TEST_F(TabletPowerButtonControllerTest, LidEventsStopForcingOff) {
+  // Pressing/releasing power button to set backlights forced off.
+  PressPowerButton();
+  ReleasePowerButton();
+  ASSERT_TRUE(GetBacklightsForcedOff());
+
+  // A lid closed event is received, we should stop forcing off backlights.
+  power_manager_client_->SetLidState(
+      chromeos::PowerManagerClient::LidState::CLOSED, tick_clock_->NowTicks());
+  EXPECT_FALSE(GetBacklightsForcedOff());
+
+  // Pressing/releasing power button again to set backlights forced off. This is
+  // for testing purpose. In real life, powerd would not repond to this event
+  // with lid closed state.
+  PressPowerButton();
+  ReleasePowerButton();
+  ASSERT_TRUE(GetBacklightsForcedOff());
+
+  // A lid open event is received, we should get stopped forcing off backlights.

[Daniel Erat, 2017/04/13 05:10:03]

nit: s/get stopped/stop/

[Qiang(Joe) Xu, 2017/04/13 17:08:47]

Done.

+  power_manager_client_->SetLidState(
+      chromeos::PowerManagerClient::LidState::OPEN, tick_clock_->NowTicks());
+  EXPECT_FALSE(GetBacklightsForcedOff());
+}
+
 }  // namespace test
 }  // namespace ash