Implement SmartText selection.

content/public/android/java/src/org/chromium/content/browser/SelectionClient.java

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.content.browser;
 
 /**
  * Interface to a content layer client that can process and modify selection text.
  */
 public interface SelectionClient {
@@ skipping 10 matching lines @@
      * @param posYPix The y coordinate of the selection start handle.
      */
     void onSelectionEvent(int eventType, float posXPix, float posYPix);
 
     /**
      * Requests to show the UI for an unhandled tap, if needed.
      * @param x The x coordinate of the tap.
      * @param y The y coordinate of the tap.
      */
     void showUnhandledTapUIIfNeeded(int x, int y);
+
+    /**
+     * Returns true if the SelectionClient sends responces that can contain information about
+     * the context menu (e.g. that we need a new menu item). In this case an embedder might want
+     * to wait for this responce before taking further actions.
+     */
+    boolean sendsSelectionPopupUpdates();
 }