Enable long press caps lock

This change is a back port from Master.
Cherry-pick: I413062c759a1d91c66fcbf5dd04050dfbf15094f

Bug: 3319295
Change-Id: I461942fde05d91519775d260410356dfcbe7f7c0

java/src/com/android/inputmethod/keyboard/KeyboardView.java

@@ -72,7 +72,7 @@ public class KeyboardView extends View implements PointerTracker.UIProxy {
     private static final boolean DEBUG_SHOW_ALIGN = false;
     private static final boolean DEBUG_KEYBOARD_GRID = false;
 
-    private static final boolean ENABLE_CAPSLOCK_BY_LONGPRESS = false;
+    private static final boolean ENABLE_CAPSLOCK_BY_LONGPRESS = true;
     private static final boolean ENABLE_CAPSLOCK_BY_DOUBLETAP = true;
 
     public static final int COLOR_SCHEME_WHITE = 0;