Test the feasibility of turning Chrome into a multi-process ActiveX control

chrome/browser/views/tab_contents_container_view.cc

 // Copyright (c) 2006-2008 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 <algorithm>
 
 #include "chrome/browser/views/tab_contents_container_view.h"
 
 #include "base/logging.h"
 #include "chrome/browser/render_view_host.h"
@@ skipping 19 matching lines @@
 }
 
 void TabContentsContainerView::SetTabContents(TabContents* tab_contents) {
   if (tab_contents_) {
     // TODO(brettw) should this move to HWNDView::Detach which is called below?
     // It needs cleanup regardless.
     HWND container_hwnd = tab_contents_->GetContainerHWND();
 
     // Hide the contents before adjusting its parent to avoid a full desktop
     // flicker.
-    ::ShowWindow(container_hwnd, SW_HIDE);
+    if(container_hwnd)
+      ::ShowWindow(container_hwnd, SW_HIDE);
 
     // Reset the parent to NULL to ensure hidden tabs don't receive messages.
-    ::SetParent(container_hwnd, NULL);
+    if(container_hwnd)
+      ::SetParent(container_hwnd, NULL);
 
     tab_contents_->WasHidden();
 
     // Unregister the tab contents window from the FocusManager.
-    views::FocusManager::UninstallFocusSubclass(container_hwnd);
+    if(container_hwnd)
+      views::FocusManager::UninstallFocusSubclass(container_hwnd);
     HWND hwnd = tab_contents_->GetContentHWND();
     if (hwnd) {
       // We may not have an HWND anymore, if the renderer crashed and we are
       // displaying the sad tab for example.
       FocusManager::UninstallFocusSubclass(hwnd);
     }
 
     views::RootView* root_view = tab_contents_->GetContentsRootView();
     if (root_view) {
       // Unlink the RootViews as a clean-up.
@@ skipping 181 matching lines @@
     Focus();
 }
 
 void TabContentsContainerView::TabContentsDestroyed(TabContents* contents) {
   // Sometimes, a TabContents is destroyed before we know about it. This allows
   // us to clean up our state in case this happens.
   DCHECK(contents == tab_contents_);
   SetTabContents(NULL);
 }