[chromedriver] Make tabs visible when switching to windows/tabs.

chrome/test/chromedriver/session_commands.cc

 // Copyright (c) 2013 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.
 
 #include "chrome/test/chromedriver/session_commands.h"
 
 #include <list>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 417 matching lines @@
       return status;
     status = web_view->ConnectIfNecessary();
     if (status.IsError())
       return status;
     status = web_view->OverrideNetworkConditions(
         *session->overridden_network_conditions);
     if (status.IsError())
       return status;
   }
 
+  status = session->chrome->ActivateWebView(web_view_id);
+  if (status.IsError())
+    return status;
   session->window = web_view_id;
   session->SwitchToTopFrame();
   session->mouse_position = WebPoint(0, 0);
   return Status(kOk);
 }
 
 Status ExecuteSetTimeout(Session* session,
                          const base::DictionaryValue& params,
                          std::unique_ptr<base::Value>* value) {
   double ms_double;
@@ skipping 440 matching lines @@
                                       std::unique_ptr<base::Value>* value) {
   WebView* web_view = nullptr;
   Status status = session->GetTargetWindow(&web_view);
   if (status.IsError())
     return status;
   status = web_view->DeleteScreenOrientation();
   if (status.IsError())
     return status;
   return Status(kOk);
 }