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 41ab1777e7fefcad799d393733b02008162cd7b3..ebbb5fbf3c7564e8e3272ef356854d04fa1410b1 100644
--- a/ash/BUILD.gn
+++ b/ash/BUILD.gn
@@ -735,6 +735,8 @@ 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",
@@ -1289,6 +1291,7 @@ 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",