Support highlighting the menu entry for Search results

1. Add a receiver to monitor the search state
2. Shoe/hide the menu highlight in the listener
3. Highlight the menu entry in SearchResultTrampoline
4. Enable/disable the receiver in SettingsInitialize

Bug: 205781792
Test: manual, robotest
Change-Id: Ia04901f504172f4f0c7b4b2ea7eda5f3713f676d

src/com/android/settings/homepage/SliceDeepLinkHomepageActivity.java

@@ -20,11 +20,6 @@ import android.content.ComponentName;
 
 /** Activity for Slices to launch Settings deep link page */
 public class SliceDeepLinkHomepageActivity extends SettingsHomepageActivity {
-    @Override
-    protected void setHomeActivity() {
-        // do not overwrite homepage activity in SettingsApplication
-    }
-
     @Override
     protected ComponentName getDeepLinkComponent() {
         return new ComponentName(getApplicationContext(), getClass());