power_manager: Send BrightnessChanged signal.

powerd.h

 // Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef POWER_DAEMON_H_
 #define POWER_DAEMON_H_
 
 #include <dbus/dbus-glib-lowlevel.h>
 #include <gtest/gtest_prod.h>  // for FRIEND_TEST
 
@@ skipping 125 matching lines @@
   static gboolean CleanShutdownTimedOut(gpointer data);
 
   void Shutdown();
   void Suspend();
 
   // Callback for Inotify of Preference directory changes.
   static gboolean PrefChangeHandler(const char* name, int wd,
                                     unsigned int mask,
                                     gpointer data);
 
+  // Send a D-Bus signal announcing that the screen brightness has been set to
+  // |level| (a percentage between 0 and 100).
+  void SendBrightnessChangedSignal(int level);
+
   // Generates UMA metrics on every idle event.
   void GenerateMetricsOnIdleEvent(bool is_idle, int64 idle_time_ms);
 
   // Generates UMA metrics on every power event based on the current
   // power status.
   void GenerateMetricsOnPowerEvent(const chromeos::PowerStatus& info);
 
   // Generates UMA metrics about the current backlight level.
   // Always returns true.
   static gboolean GenerateBacklightLevelMetric(gpointer data);
@@ skipping 91 matching lines @@
   KeyCode key_brightness_up_;
   KeyCode key_brightness_down_;
   KeyCode key_power_off_;
   KeyCode key_f6_;
   KeyCode key_f7_;
 };
 
 }  // namespace power_manager
 
 #endif  // POWER_DAEMON_H_