[TTS] Add an ACK message to SelectWordAroundCaret.

content/public/android/java/src/org/chromium/content/browser/ContextualSearchClient.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 client that implements Contextual Search handling for the content layer.
  */
 public interface ContextualSearchClient {
@@ 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);
+
+    /**
+     * Acknowledges that a selectWordAroundCaret action has completed with the given result.
+     * @param didSelect Whether a word was actually selected or not.
+     * @param startAdjust The adjustment to the selection start offset needed to select the word.
+     *        This is typically a negative number (expressed in terms of number of characters).
+     * @param endAdjust The adjustment to the selection end offset needed to select the word.
+     *        This is typically a positive number (expressed in terms of number of characters).
+     */
+    void selectWordAroundCaretAck(boolean didSelect, int startAdjust, int endAdjust);
 }