Support window.opener after a process swap.

content/browser/tab_contents/tab_contents.cc

 // Copyright (c) 2011 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 "content/browser/tab_contents/tab_contents.h"
 
 #include <cmath>
 
 #include "base/auto_reset.h"
 #include "base/command_line.h"
@@ skipping 107 matching lines @@
 //   pending cross-site request, and then installs a CrossSiteEventHandler.
 // - When RDH receives a response, the BufferedEventHandler determines whether
 //   it is a download.  If so, it sends a message to the new renderer causing
 //   it to cancel the request, and the download proceeds in the download
 //   thread.  For now, we stay in a PENDING state (with a pending RVH) until
 //   the next DidNavigate event for this TabContents.  This isn't ideal, but it
 //   doesn't affect any functionality.
 // - After RDH receives a response and determines that it is safe and not a
 //   download, it pauses the response to first run the old page's onunload
 //   handler.  It does this by asynchronously calling the OnCrossSiteResponse
-//   method of TabContents on the UI thread, which sends a ClosePage message
+//   method of TabContents on the UI thread, which sends a SwapOut message
 //   to the current RVH.
-// - Once the onunload handler is finished, a ClosePage_ACK message is sent to
+// - Once the onunload handler is finished, a SwapOut_ACK message is sent to
 //   the ResourceDispatcherHost, who unpauses the response.  Data is then sent
 //   to the pending RVH.
 // - The pending renderer sends a FrameNavigate message that invokes the
 //   DidNavigate method.  This replaces the current RVH with the
 //   pending RVH and goes back to the NORMAL RendererState.
+// - The previous renderer is kept swapped out in RenderViewHostManager in case
+//   the user goes back.  The process only stays live if another tab is using
+//   it, but if so, the existing frame relationships will be maintained.
 
 namespace {
 
 // Amount of time we wait between when a key event is received and the renderer
 // is queried for its state and pushed to the NavigationEntry.
 const int kQueryStateDelay = 5000;
 
 const int kSyncWaitDelay = 40;
 
 // The list of prefs we want to observe.
@@ skipping 1865 matching lines @@
 
   // Run post-commit tasks.
   if (details.is_main_frame)
     DidNavigateMainFramePostCommit(details, params);
   DidNavigateAnyFramePostCommit(rvh, details, params);
 }
 
 void TabContents::UpdateState(RenderViewHost* rvh,
                               int32 page_id,
                               const std::string& state) {
-  DCHECK(rvh == render_view_host());
+  // Ensure that this state update comes from either the active RVH or one of
+  // the swapped out RVHs.  We don't expect to hear from any other RVHs.
+  DCHECK(rvh == render_view_host() || render_manager_.IsSwappedOut(rvh));
 
   // We must be prepared to handle state updates for any page, these occur
   // when the user is scrolling and entering form data, as well as when we're
   // leaving a page, in which case our state may have already been moved to
   // the next page. The navigation controller will look up the appropriate
   // NavigationEntry and update it when it is notified via the delegate.
 
   int entry_index = controller_.GetEntryIndexWithPageID(
-      GetSiteInstance(), page_id);
+      rvh->site_instance(), page_id);
   if (entry_index < 0)
     return;
   NavigationEntry* entry = controller_.GetEntryAtIndex(entry_index);
 
   if (state == entry->content_state())
     return;  // Nothing to update.
   entry->set_content_state(state);
   controller_.NotifyEntryChanged(entry, entry_index);
 }
 
@@ skipping 535 matching lines @@
 
 void TabContents::CreateViewAndSetSizeForRVH(RenderViewHost* rvh) {
   RenderWidgetHostView* rwh_view = view()->CreateViewForWidget(rvh);
   rwh_view->SetSize(view()->GetContainerSize());
 }
 
 void TabContents::OnOnlineStateChanged(bool online) {
   render_view_host()->Send(new ViewMsg_NetworkStateChanged(
       render_view_host()->routing_id(), online));
 }