Make ModifierKeySatate and ShiftKeyState non-public class

Bug: 5708602
Change-Id: I149c2dab26774686e5c578bbf780081e9fb30e7c

java/src/com/android/inputmethod/keyboard/internal/KeyboardState.java

@@ -107,7 +107,7 @@ public class KeyboardState {
 
     @Override
     public String toString() {
-        return "shiftKeyState=" + mShiftKeyState
-                + " symbolKeyState=" + mSymbolKeyState;
+        return "[shift=" + mShiftKeyState
+                + " symbol=" + mSymbolKeyState + "]";
     }
 }

java/src/com/android/inputmethod/keyboard/internal/ModifierKeyState.java

@@ -20,7 +20,7 @@ import android.util.Log;
 
 import com.android.inputmethod.keyboard.KeyboardSwitcher;
 
-public class ModifierKeyState {
+class ModifierKeyState {
     protected static final String TAG = "ModifierKeyState";
     protected static final boolean DEBUG = KeyboardSwitcher.DEBUG_STATE;
 

java/src/com/android/inputmethod/keyboard/internal/ShiftKeyState.java

@@ -18,7 +18,7 @@ package com.android.inputmethod.keyboard.internal;
 
 import android.util.Log;
 
-public class ShiftKeyState extends ModifierKeyState {
+class ShiftKeyState extends ModifierKeyState {
     private static final int PRESSING_ON_SHIFTED = 3; // both temporary shifted & shift locked
     private static final int IGNORING = 4;