[Android] Refactor NativeView to be able to use it for AutofillDialog.

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

-// Copyright (c) 2012 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.view.View;
-
-/**
- * Interface to add and remove views from the implementing view.
- */
-public interface ContainerViewDelegate {
-
-    /**
-     * Add the view.
-     * @param view The view to be added.
-     */
-    public void addViewToContainerView(View view);
-
-    /**
-     * Remove the view if it is present, otherwise do nothing.
-     * @param view The view to be removed.
-     */
-    public void removeViewFromContainerView(View view);
-
-    /**
-     * Used for any calculations that need to place a View near a particular piece of web content.
-     * @return The Y offset in pixels to apply to any added views.
-     */
-    public int getChildViewOffsetYPix();
-}