[TTS] Add an ACK message to SelectWordAroundCaret.

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

 // Copyright 2017 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;
 
 import android.support.annotation.IntDef;
 import android.text.TextUtils;
 
 import org.chromium.base.annotations.CalledByNative;
@@ skipping 92 matching lines @@
     }
 
     @Override
     public void showUnhandledTapUIIfNeeded(int x, int y) {}
 
     @Override
     public boolean sendsSelectionPopupUpdates() {
         return true;
     }
 
+    @Override
+    public void selectWordAroundCaretAck(boolean didSelect, int startAdjust, int endAdjust) {}
+
     private void cancelAllRequests() {
         if (mNativeContextSelectionClient != 0) {
             nativeCancelAllRequests(mNativeContextSelectionClient);
         }
 
         mProvider.cancelAllRequests();
     }
 
     private void requestSurroundingText(@RequestType int callbackData) {
         if (mNativeContextSelectionClient == 0) {
@@ skipping 25 matching lines @@
                 assert false : "Unexpected callback data";
                 break;
         }
     }
 
     private native long nativeInit(WebContents webContents);
     private native void nativeRequestSurroundingText(
             long nativeContextSelectionClient, int numExtraCharacters, int callbackData);
     private native void nativeCancelAllRequests(long nativeContextSelectionClient);
 }