android: Launcher3: support to goto ALL_APPS by press F12

Signed-off-by: hmz007 <hmz007@gmail.com>

packages/apps/Launcher3/src/com/android/launcher3/Launcher.java

@@ -3010,6 +3010,12 @@ public class Launcher extends StatefulActivity<LauncherState> implements Launche
                 showDefaultOptions(-1, -1);
             }
             return true;
+        } else if (keyCode == KeyEvent.KEYCODE_F12) {
+            if (isInState(NORMAL)) {
+                getStateManager().goToState(ALL_APPS);
+                return true;
+            }
+
         }
         return super.onKeyUp(keyCode, event);
     }