dbus_bindings/power_manager.xml

<?xml version="1.0"?>
<!DOCTYPE node PUBLIC "-//freedesktop//DTD D-BUS Object Introspection 1.0//EN"
	  "http://www.freedesktop.org/standards/dbus/1.0/introspect.dtd">

<node name="/org/chromium/PowerManager">
  <interface name="org.chromium.PowerManager">
    <method name="RegisterSuspendDelay">
      <arg name="delay_ms" direction="in" type="u"/>
    </method>
    <signal name="SuspendDelay">
      <arg name="sequence_number" type="u"/>
    </signal>
    <signal name="PowerStateChanged">
      <arg name="new_power_state" type="s"/>
    </signal>
  </interface>
</node>