Support InputMethodManager#updateCursorAnchorInfo for Android 5.0

content/public/android/java/src/org/chromium/content/browser/input/ThreadedInputConnection.java

 // Copyright 2016 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.input;
 
 import android.os.Bundle;
 import android.os.Handler;
 import android.os.Looper;
 import android.view.KeyCharacterMap;
@@ skipping 583 matching lines @@
     public boolean performPrivateCommand(String action, Bundle data) {
         if (DEBUG_LOGS) Log.w(TAG, "performPrivateCommand [%s]", action);
         assertOnImeThread();
         return false;
     }
 
     /**
      * @see InputConnection#requestCursorUpdates(int)
      */
     @Override
-    public boolean requestCursorUpdates(int cursorUpdateMode) {
+    public boolean requestCursorUpdates(final int cursorUpdateMode) {
         if (DEBUG_LOGS) Log.w(TAG, "requestCursorUpdates [%x]", cursorUpdateMode);
         assertOnImeThread();
-        return false;
+        ThreadUtils.postOnUiThread(new Runnable() {
+            @Override
+            public void run() {
+                mImeAdapter.onRequestCursorUpdates(cursorUpdateMode);
+            }
+        });
+        return true;
     }
-}
+}