[Night Light] CL4: Automatic schedule backend.

ash/BUILD.gn

Index: ash/BUILD.gn
diff --git a/ash/BUILD.gn b/ash/BUILD.gn
index 89d2f20a2f3966ede88328fa7163134ac7e9911c..8ac27270c00ed6a3931491e9e6817b3fbe00e2f0 100644
--- a/ash/BUILD.gn
+++ b/ash/BUILD.gn
@@ -421,6 +421,8 @@ component("ash") {
     "system/networking_config_delegate.h",
     "system/night_light/night_light_controller.cc",
     "system/night_light/night_light_controller.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",
@@ -853,6 +855,7 @@ component("ash") {
     "//components/vector_icons",
     "//components/wallpaper",
     "//device/bluetooth",
+    "//device/geolocation",
     "//gpu/command_buffer/client",
     "//gpu/command_buffer/client:gles2_interface",
     "//media",
@@ -1210,6 +1213,7 @@ 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",