Tablet-like power button behavior on Convertible/Tablet ChromeOS devices

ash/BUILD.gn

Index: ash/BUILD.gn
diff --git a/ash/BUILD.gn b/ash/BUILD.gn
index 3fe326a0c1f1da06d07ce437b738cb4aa89fa3c4..403157f46f2a2d9db8ab691282f75ec577cc13e4 100644
--- a/ash/BUILD.gn
+++ b/ash/BUILD.gn
@@ -734,6 +734,8 @@ component("ash") {
     "sticky_keys/sticky_keys_state.h",
     "system/chromeos/power/power_event_observer.cc",
     "system/chromeos/power/power_event_observer.h",
+    "system/chromeos/power/tablet_power_button_controller.cc",
+    "system/chromeos/power/tablet_power_button_controller.h",
     "system/chromeos/power/video_activity_notifier.cc",
     "system/chromeos/power/video_activity_notifier.h",
     "system/chromeos/rotation/tray_rotation_lock.cc",
@@ -1288,6 +1290,7 @@ test("ash_unittests") {
     "sticky_keys/sticky_keys_overlay_unittest.cc",
     "sticky_keys/sticky_keys_unittest.cc",
     "system/chromeos/power/power_event_observer_unittest.cc",
+    "system/chromeos/power/tablet_power_button_controller_unittest.cc",
     "system/chromeos/power/video_activity_notifier_unittest.cc",
     "system/chromeos/rotation/tray_rotation_lock_unittest.cc",
     "system/chromeos/screen_layout_observer_unittest.cc",