[TTS] Add an ACK message to SelectWordAroundCaret.

content/public/android/java/src/org/chromium/content/browser/SelectionPopupController.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;
 
 import android.annotation.TargetApi;
 import android.app.Activity;
 import android.app.SearchManager;
 import android.content.ClipboardManager;
@@ skipping 971 matching lines @@
         assert !mPendingShowActionMode;
         assert !mHidden;
     }
 
     void onShowUnhandledTapUIIfNeeded(int x, int y) {
         if (mSelectionClient != null) {
             mSelectionClient.showUnhandledTapUIIfNeeded(x, y);
         }
     }
 
+    void onSelectWordAroundCaretAck(boolean didSelect, int startAdjust, int endAdjust) {
+        if (mSelectionClient != null) {
+            mSelectionClient.selectWordAroundCaretAck(didSelect, startAdjust, endAdjust);
+        }
+    }
+
     void destroyActionModeAndUnselect() {
         mUnselectAllOnDismiss = true;
         finishActionMode();
     }
 
     void destroyActionModeAndKeepSelection() {
         mUnselectAllOnDismiss = false;
         finishActionMode();
     }
 
@@ skipping 58 matching lines @@
                 if (mPendingShowActionMode) return;
             }
 
             // Rely on this method to clear |mHidden| and unhide the action mode.
             showActionModeOrClearOnFailure();
         }
     };
 
     private native void nativeInit(WebContents webContents);
 }