Add optional feedback button for settings search

Adds mechanism for adding a button in the search screen
and stubs to show and hide the button.

Fixes: 35164702
Test: make -j40 RunSettingsRoboTests
Change-Id: I34d245e84b62cedf2dc6e5de4ea336c5a99ffd31

src/com/android/settings/search2/SearchActivity.java

@@ -21,6 +21,7 @@ import android.app.Fragment;
 import android.app.FragmentManager;
 import android.os.Bundle;
 
+import android.view.WindowManager;
 import com.android.settings.R;
 
 public class SearchActivity extends Activity {
@@ -29,6 +30,8 @@ public class SearchActivity extends Activity {
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.search_main);
+        // Keeps layouts in-place when keyboard opens.
+        getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_ADJUST_PAN);
 
         FragmentManager fragmentManager = getFragmentManager();
         Fragment fragment = fragmentManager.findFragmentById(R.id.main_content);