Start upstreaming accessibility.

content/shell/android/java/src/org/chromium/content_shell/ShellManager.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_shell;
 
 import android.content.Context;
 import android.util.AttributeSet;
 import android.view.LayoutInflater;
 import android.view.Surface;
@@ skipping 68 matching lines @@
 
     @SuppressWarnings("unused")
     @CalledByNative
     private Object createShell() {
         LayoutInflater inflater =
                 (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
         Shell shellView = (Shell) inflater.inflate(R.layout.shell_view, null);
         shellView.setSurfaceView(mSurfaceView);
 
         removeAllViews();
+        if (mActiveShell != null && mActiveShell.getContentView() != null) {
+            mActiveShell.getContentView().onHide();
+        }
+
         addView(shellView, new FrameLayout.LayoutParams(
                 FrameLayout.LayoutParams.MATCH_PARENT, FrameLayout.LayoutParams.MATCH_PARENT));
         mActiveShell = shellView;
+        if (mActiveShell.getContentView() != null) mActiveShell.getContentView().onShow();
 
         return shellView;
     }
 
     private static native void nativeInit(Object shellManagerInstance);
     private static native void nativeLaunchShell(String url);
     private static native void nativeSurfaceCreated(Surface surface);
     private static native void nativeSurfaceDestroyed();
     private static native void nativeSurfaceSetSize(int width, int height);
 }