Support for KEYCODE_LANGUAGE_SWITCH in VirtualKeyboard

Fix: 300385158
Test: presubmit
Test: manual, verified that KEYCODE_LANGUAGE_SWITCH reaches the framework

Change-Id: If98addb0f9f3cff93bb0159b8fde171acf6a3998

core/java/android/hardware/input/VirtualKeyEvent.java

@@ -172,6 +172,7 @@ public final class VirtualKeyEvent implements Parcelable {
             KeyEvent.KEYCODE_BREAK,
             KeyEvent.KEYCODE_BACK,
             KeyEvent.KEYCODE_FORWARD,
+            KeyEvent.KEYCODE_LANGUAGE_SWITCH,
     })
     @Retention(RetentionPolicy.SOURCE)
     public @interface SupportedKeycode {

data/keyboards/Generic.kl

@@ -324,7 +324,7 @@ key 362   GUIDE
 # key 365 "KEY_EPG"
 key 366   DVR
 # key 367 "KEY_MHP"
-# key 368 "KEY_LANGUAGE"
+key 368   LANGUAGE_SWITCH
 # key 369 "KEY_TITLE"
 key 370   CAPTIONS
 # key 371 "KEY_ANGLE"