Hide searchbox when header protection is on.

Bug: 191726215
Test: manual
Change-Id: I086a05654faf718683ebe5dfbcf64b6bd6347ca8
diff --git a/src/com/android/launcher3/ExtendedEditText.java b/src/com/android/launcher3/ExtendedEditText.java
index 20c6938..e8510b7 100644
--- a/src/com/android/launcher3/ExtendedEditText.java
+++ b/src/com/android/launcher3/ExtendedEditText.java
@@ -96,6 +96,9 @@
         }
     }
 
+    // inherited class can override to change the appearance of the edit text.
+    public void show() {}
+
     public void showKeyboard() {
         mShowImeAfterFirstLayout = !showSoftInput();
     }