Shell: Show an OSD for the keyboard brightness

REVIEW: 118975

shell/osd.cpp

@@ -61,6 +61,11 @@ void Osd::brightnessChanged(int percent)
     showProgress(QStringLiteral("video-display-brightness"), percent);
 }
 
+void Osd::keyboardBrightnessChanged(int percent)
+{
+    showProgress(QStringLiteral("input-keyboard-brightness"), percent);
+}
+
 void Osd::volumeChanged(int percent)
 {
     QString icon;

shell/osd.h

@@ -41,6 +41,7 @@ public:
 
 public Q_SLOTS:
     void brightnessChanged(int percent);
+    void keyboardBrightnessChanged(int percent);
     void volumeChanged(int percent);
     void mediaPlayerVolumeChanged(int percent, const QString &playerName, const QString &playerIconName);
     void kbdLayoutChanged(const QString &layoutName);