cros: Update touchscreen status with backlights forced off state during start

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 489 matching lines @@
   PressPowerButton();
   ReleasePowerButton();
   ASSERT_TRUE(GetBacklightsForcedOff());
 
   // A lid open event is received, we should stop forcing off backlights.
   power_manager_client_->SetLidState(
       chromeos::PowerManagerClient::LidState::OPEN, tick_clock_->NowTicks());
   EXPECT_FALSE(GetBacklightsForcedOff());
 }
 
+// Tests that with system reboot, the local state of touchscreen enabled state
+// should be synced with new backlights forced off state from powerd.
+TEST_F(TabletPowerButtonControllerTest, SyncTouchscreenStatus) {
+  // Pressing/releasing power button to set backlights forced off.
+  PressPowerButton();
+  ReleasePowerButton();
+  ASSERT_TRUE(GetBacklightsForcedOff());
+  ASSERT_FALSE(shell_delegate_->IsTouchscreenEnabledInPrefs(true));

[Daniel Erat, 2017/05/03 03:28:39]

i'm worried that this isn't testing the real case. it'd be more realistic to not
do this in the test and instead set the local state pref before the
TabletPowerButtonController is initialized.

[Qiang(Joe) Xu, 2017/05/03 03:53:27]

makes sense. Updated.

+
+  // Simulate system reboot by resetting backlights forced off state in powerd
+  // and TabletPowerButtonController.
+  power_manager_client_->SetBacklightsForcedOff(false);
+  Shell::Get()
+      ->power_button_controller()
+      ->ResetTabletPowerButtonControllerForTest();
+
+  // Check the local state of touchscreen enabled state is in line with
+  // backlights forced off state.
+  EXPECT_FALSE(GetBacklightsForcedOff());
+  EXPECT_TRUE(shell_delegate_->IsTouchscreenEnabledInPrefs(true));
+}
+
 }  // namespace test
 }  // namespace ash