input: introduce new navigation bar key event source

* When generating virtual navigation bar KeyEvent, set
  a specific source fort it. There is no precise way to
  recognize if the KeyEvent is coming from KeyButtonView.
  Another way is passing another flag.

Change-Id: I243c9f91afcbf4c430e2d526e8c814a5a7975e51
Signed-off-by: Mohammad Hasan Keramat J <ikeramat80@gmail.com>

core/java/android/view/InputDevice.java

@@ -308,6 +308,15 @@ public final class InputDevice implements Parcelable {
      */
     public static final int SOURCE_HDMI = 0x02000000 | SOURCE_CLASS_BUTTON;
 
+    /**
+     * The input source is a specific virtual event sent from navigation bar.
+     *
+     * @see com.android.systemui.statusbar.policy.KeyButtonView#sendEvent()
+     * @author Carlo Savignano
+     * @hide
+     */
+    public static final int SOURCE_NAVIGATION_BAR = 0x04000000 | SOURCE_CLASS_BUTTON;
+
     /**
      * A special input source constant that is used when filtering input devices
      * to match devices that provide any type of input source.

packages/SystemUI/src/com/android/systemui/statusbar/policy/KeyButtonView.java

@@ -419,7 +419,7 @@ public class KeyButtonView extends ImageView implements ButtonInterface {
         final KeyEvent ev = new KeyEvent(mDownTime, when, action, mCode, repeatCount,
                 0, KeyCharacterMap.VIRTUAL_KEYBOARD, 0,
                 flags | KeyEvent.FLAG_FROM_SYSTEM | KeyEvent.FLAG_VIRTUAL_HARD_KEY,
-                InputDevice.SOURCE_KEYBOARD);
+                InputDevice.SOURCE_NAVIGATION_BAR);
 
         int displayId = INVALID_DISPLAY;