[Night Light] CL4: Automatic schedule backend.

ash/BUILD.gn

Index: ash/BUILD.gn
diff --git a/ash/BUILD.gn b/ash/BUILD.gn
index 9944a1ebb9236ea814fba23e0f8f383c5f26e831..bd334328e3a588ddddd886b381033485a0952a56 100644
--- a/ash/BUILD.gn
+++ b/ash/BUILD.gn
@@ -422,6 +422,8 @@ component("ash") {
     "system/night_light/night_light_controller.h",
     "system/night_light/night_light_toggle_button.cc",
     "system/night_light/night_light_toggle_button.h",
+    "system/night_light/time_of_day.cc",
+    "system/night_light/time_of_day.h",
     "system/night_light/tray_night_light.cc",
     "system/night_light/tray_night_light.h",
     "system/overview/overview_button_tray.cc",
@@ -854,6 +856,7 @@ component("ash") {
     "//components/vector_icons",
     "//components/wallpaper",
     "//device/bluetooth",
+    "//device/geolocation",
     "//gpu/command_buffer/client",
     "//gpu/command_buffer/client:gles2_interface",
     "//media",
@@ -1216,6 +1219,7 @@ source_set("common_unittests") {
     "system/network/tray_network_unittest.cc",
     "system/network/vpn_list_unittest.cc",
     "system/night_light/night_light_controller_unittest.cc",
+    "system/night_light/time_of_day_unittest.cc",
     "system/night_light/tray_night_light_unittest.cc",
     "system/overview/overview_button_tray_unittest.cc",
     "system/palette/mock_palette_tool_delegate.cc",