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 3c4266f0b1fe92af107901a7f2389a7f3b0a2785..655d707e54ea142955586e68b7f6feb7f55187ba 100644
--- a/ash/BUILD.gn
+++ b/ash/BUILD.gn
@@ -824,6 +824,8 @@ component("ash") {
     "wm/system_modal_container_event_filter_delegate.h",
     "wm/system_wallpaper_controller.cc",
     "wm/system_wallpaper_controller.h",
+    "wm/tablet_power_state_delegate_chromeos.cc",
+    "wm/tablet_power_state_delegate_chromeos.h",
     "wm/toplevel_window_event_handler.cc",
     "wm/toplevel_window_event_handler.h",
     "wm/video_detector.cc",
@@ -1331,6 +1333,7 @@ test("ash_unittests") {
     "wm/overview/window_selector_unittest.cc",
     "wm/panels/panel_layout_manager_unittest.cc",
     "wm/panels/panel_window_resizer_unittest.cc",
+    "wm/power_button_controller_unittest.cc",
     "wm/resize_shadow_and_cursor_unittest.cc",
     "wm/root_window_layout_manager_unittest.cc",
     "wm/screen_dimmer_unittest.cc",
@@ -1459,6 +1462,7 @@ test("ash_unittests") {
 
       # Talks to ChromeOS system services.
       "wm/lock_state_controller_unittest.cc",
+      "wm/power_button_controller_unittest.cc",
 
       # Maximize mode is only available on Chrome OS.
       "wm/maximize_mode/maximize_mode_controller_unittest.cc",