[DRAFT] Create RenderFrameHostManager.

content/browser/frame_host/render_view_host_manager.cc

Index: content/browser/frame_host/render_view_host_manager.cc
diff --git a/content/browser/frame_host/render_view_host_manager.cc b/content/browser/frame_host/render_view_host_manager.cc
index a8473cd19969eb4c3abaf0180bae9767008847bd..10390c9c705620c47a8bafa8d2f661654b714939 100644
--- a/content/browser/frame_host/render_view_host_manager.cc
+++ b/content/browser/frame_host/render_view_host_manager.cc
@@ -54,33 +54,35 @@ RenderViewHostManager::PendingNavigationParams::PendingNavigationParams(
 RenderViewHostManager::PendingNavigationParams::~PendingNavigationParams() {}
 
 RenderViewHostManager::RenderViewHostManager(
+    FrameTreeNode* frame_tree_node,
     RenderViewHostDelegate* render_view_delegate,
     RenderWidgetHostDelegate* render_widget_delegate,
     Delegate* delegate)
-    : delegate_(delegate),
+    : frame_tree_node_(frame_tree_node),
+      delegate_(delegate),
       cross_navigation_pending_(false),
       render_view_delegate_(render_view_delegate),
       render_widget_delegate_(render_widget_delegate),
-      render_view_host_(NULL),
-      pending_render_view_host_(NULL),
+      render_frame_host_(NULL),
+      pending_render_frame_host_(NULL),
       interstitial_page_(NULL) {
 }
 
 RenderViewHostManager::~RenderViewHostManager() {
-  if (pending_render_view_host_)
+  if (pending_render_frame_host_)
     CancelPending();
 
-  // We should always have a main RenderViewHost except in some tests.
-  RenderViewHostImpl* render_view_host = render_view_host_;
-  render_view_host_ = NULL;
-  if (render_view_host)
-    render_view_host->Shutdown();
+  // We should always have a current RenderFrameHost except in some tests.
+  RenderFrameHostImpl* render_frame_host = render_frame_host_;
+  render_frame_host_ = NULL;
+  if (render_frame_host)
+    delete render_frame_host;
 
-  // Shut down any swapped out RenderViewHosts.
-  for (RenderViewHostMap::iterator iter = swapped_out_hosts_.begin();
+  // Delete any swapped out RenderFrameHosts.
+  for (RenderFrameHostMap::iterator iter = swapped_out_hosts_.begin();
        iter != swapped_out_hosts_.end();
        ++iter) {
-    iter->second->Shutdown();
+    delete iter->second;
   }
 }
 
@@ -89,16 +91,25 @@ void RenderViewHostManager::Init(BrowserContext* browser_context,
                                  int routing_id,
                                  int main_frame_routing_id) {
   // Create a RenderViewHost, once we have an instance.  It is important to
-  // immediately give this SiteInstance to a RenderViewHost so that it is
-  // ref counted.
+  // immediately give this SiteInstance to a RenderViewHost so that the
+  // SiteInstance is ref counted.
   if (!site_instance)
     site_instance = SiteInstance::Create(browser_context);
-  render_view_host_ = static_cast<RenderViewHostImpl*>(
-      RenderViewHostFactory::Create(
-          site_instance, render_view_delegate_, render_widget_delegate_,
-          routing_id, main_frame_routing_id, false,
-          delegate_->IsHidden()));
-  render_view_host_->AttachToFrameTree();
+
+  if (main_frame_routing_id == MSG_ROUTING_NONE)
+    main_frame_routing_id = site_instance->GetProcess()->GetNextRoutingID();
+
+  // TODO(creis): Abstract this out and share with CreateRenderFrame.
+  FrameTree* frame_tree = render_view_delegate_->GetFrameTree();
+  RenderViewHostImpl* render_view_host =
+      frame_tree->GetRenderViewHostForNewFrame(site_instance, routing_id,
+                                               main_frame_routing_id,
+                                               false, false);
+  render_frame_host_ = new RenderFrameHostImpl(render_view_host,
+                                               frame_tree,
+                                               frame_tree_node_,
+                                               main_frame_routing_id,
+                                               false);
 
   // Keep track of renderer processes as they start to shut down or are
   // crashed/killed.
@@ -109,19 +120,25 @@ void RenderViewHostManager::Init(BrowserContext* browser_context,
 }
 
 RenderViewHostImpl* RenderViewHostManager::current_host() const {
-  return render_view_host_;
+  return render_frame_host_->render_view_host();
 }
 
 RenderViewHostImpl* RenderViewHostManager::pending_render_view_host() const {
-  return pending_render_view_host_;
+  if (!pending_render_frame_host_)
+    return NULL;
+  return pending_render_frame_host_->render_view_host();
+}
+
+RenderFrameHostImpl* RenderViewHostManager::pending_render_frame_host() const {
+  return pending_render_frame_host_;
 }
 
 RenderWidgetHostView* RenderViewHostManager::GetRenderWidgetHostView() const {
   if (interstitial_page_)
     return interstitial_page_->GetView();
-  if (!render_view_host_)
+  if (!render_frame_host_)
     return NULL;
-  return render_view_host_->GetView();
+  return render_frame_host_->render_view_host()->GetView();
 }
 
 void RenderViewHostManager::SetPendingWebUI(const NavigationEntryImpl& entry) {
@@ -144,107 +161,120 @@ void RenderViewHostManager::SetPendingWebUI(const NavigationEntryImpl& entry) {
 RenderViewHostImpl* RenderViewHostManager::Navigate(
     const NavigationEntryImpl& entry) {
   TRACE_EVENT0("browser", "RenderViewHostManager:Navigate");
-  // Create a pending RenderViewHost. It will give us the one we should use
-  RenderViewHostImpl* dest_render_view_host =
-      static_cast<RenderViewHostImpl*>(UpdateRendererStateForNavigate(entry));
-  if (!dest_render_view_host)
-    return NULL;  // We weren't able to create a pending render view host.
-
-  // If the current render_view_host_ isn't live, we should create it so
-  // that we don't show a sad tab while the dest_render_view_host fetches
+  // Create a pending RenderFrameHost to use for the navigation.
+  RenderFrameHostImpl* dest_render_frame_host =
+      UpdateRendererStateForNavigate(entry);
+  if (!dest_render_frame_host)
+    return NULL;  // We weren't able to create a pending render frame host.
+
+  // If the current render_frame_host_ isn't live, we should create it so
+  // that we don't show a sad tab while the dest_render_frame_host fetches
   // its first page.  (Bug 1145340)
-  if (dest_render_view_host != render_view_host_ &&
-      !render_view_host_->IsRenderViewLive()) {
+  if (dest_render_frame_host != render_frame_host_ &&
+      !render_frame_host_->render_view_host()->IsRenderViewLive()) {
     // Note: we don't call InitRenderView here because we are navigating away
     // soon anyway, and we don't have the NavigationEntry for this host.
-    delegate_->CreateRenderViewForRenderManager(render_view_host_,
-                                                MSG_ROUTING_NONE);
+    delegate_->CreateRenderViewForRenderManager(
+        render_frame_host_->render_view_host(), MSG_ROUTING_NONE);
   }
 
   // If the renderer crashed, then try to create a new one to satisfy this
   // navigation request.
-  if (!dest_render_view_host->IsRenderViewLive()) {
+  if (!dest_render_frame_host->render_view_host()->IsRenderViewLive()) {
     // Recreate the opener chain.
     int opener_route_id = delegate_->CreateOpenerRenderViewsForRenderManager(
-        dest_render_view_host->GetSiteInstance());
-    if (!InitRenderView(dest_render_view_host, opener_route_id))
+        dest_render_frame_host->render_view_host()->GetSiteInstance());
+    if (!InitRenderView(dest_render_frame_host->render_view_host(),
+                        opener_route_id))
       return NULL;
 
     // Now that we've created a new renderer, be sure to hide it if it isn't
     // our primary one.  Otherwise, we might crash if we try to call Show()
     // on it later.
-    if (dest_render_view_host != render_view_host_ &&
-        dest_render_view_host->GetView()) {
-      dest_render_view_host->GetView()->Hide();
+    if (dest_render_frame_host != render_frame_host_ &&
+        dest_render_frame_host->render_view_host()->GetView()) {
+      dest_render_frame_host->render_view_host()->GetView()->Hide();
     } else {
       // This is our primary renderer, notify here as we won't be calling
       // CommitPending (which does the notify).
-      delegate_->NotifySwappedFromRenderManager(NULL, render_view_host_);
+      // TODO(creis): only do this for top-level frames, when the RVH changes.
+      delegate_->NotifySwappedFromRenderManager(
+          NULL, render_frame_host_->render_view_host());
     }
   }
 
-  return dest_render_view_host;
+  // TODO(creis): Return the RFH instead, once we can navigate RFHs.
+  return dest_render_frame_host->render_view_host();
 }
 
 void RenderViewHostManager::Stop() {
-  render_view_host_->Stop();
+  render_frame_host_->render_view_host()->Stop();
 
   // If we are cross-navigating, we should stop the pending renderers.  This
   // will lead to a DidFailProvisionalLoad, which will properly destroy them.
   if (cross_navigation_pending_) {
-    pending_render_view_host_->Send(
-        new ViewMsg_Stop(pending_render_view_host_->GetRoutingID()));
+    pending_render_frame_host_->render_view_host()->Send(new ViewMsg_Stop(
+        pending_render_frame_host_->render_view_host()->GetRoutingID()));
   }
 }
 
 void RenderViewHostManager::SetIsLoading(bool is_loading) {
-  render_view_host_->SetIsLoading(is_loading);
-  if (pending_render_view_host_)
-    pending_render_view_host_->SetIsLoading(is_loading);
+  render_frame_host_->render_view_host()->SetIsLoading(is_loading);
+  if (pending_render_frame_host_)
+    pending_render_frame_host_->render_view_host()->SetIsLoading(is_loading);
 }
 
 bool RenderViewHostManager::ShouldCloseTabOnUnresponsiveRenderer() {
   if (!cross_navigation_pending_)
     return true;
 
-  // We should always have a pending RVH when there's a cross-process navigation
+  // We should always have a pending RFH when there's a cross-process navigation
   // in progress.  Sanity check this for http://crbug.com/276333.
-  CHECK(pending_render_view_host_);
+  CHECK(pending_render_frame_host_);
 
   // If the tab becomes unresponsive during {before}unload while doing a
   // cross-site navigation, proceed with the navigation.  (This assumes that
-  // the pending RenderViewHost is still responsive.)
-  if (render_view_host_->is_waiting_for_unload_ack()) {
+  // the pending RenderFrameHost is still responsive.)
+  if (render_frame_host_->render_view_host()->is_waiting_for_unload_ack()) {
     // The request has been started and paused while we're waiting for the
     // unload handler to finish.  We'll pretend that it did.  The pending
     // renderer will then be swapped in as part of the usual DidNavigate logic.
     // (If the unload handler later finishes, this call will be ignored because
     // the pending_nav_params_ state will already be cleaned up.)
     current_host()->OnSwappedOut(true);
-  } else if (render_view_host_->is_waiting_for_beforeunload_ack()) {
+  } else if (render_frame_host_->render_view_host()->
+                 is_waiting_for_beforeunload_ack()) {
     // Haven't gotten around to starting the request, because we're still
     // waiting for the beforeunload handler to finish.  We'll pretend that it
     // did finish, to let the navigation proceed.  Note that there's a danger
     // that the beforeunload handler will later finish and possibly return
     // false (meaning the navigation should not proceed), but we'll ignore it
     // in this case because it took too long.
-    if (pending_render_view_host_->are_navigations_suspended())
-      pending_render_view_host_->SetNavigationsSuspended(
+    if (pending_render_frame_host_->render_view_host()->
+            are_navigations_suspended()) {
+      pending_render_frame_host_->render_view_host()->SetNavigationsSuspended(
           false, base::TimeTicks::Now());
+    }
   }
   return false;
 }
 
+// TODO(creis): Remove this in favor of SwappedOutFrame.
 void RenderViewHostManager::SwappedOut(RenderViewHost* render_view_host) {
   // Make sure this is from our current RVH, and that we have a pending
   // navigation from OnCrossSiteResponse.  (There may be no pending navigation
   // for data URLs that don't make network requests, for example.)   If not,
   // just return early and ignore.
-  if (render_view_host != render_view_host_ || !pending_nav_params_.get()) {
+  if (render_view_host != render_frame_host_->render_view_host() ||
+      !pending_nav_params_.get()) {
     pending_nav_params_.reset();
     return;
   }
 
+  // We should probably sanity check that this is for the correct frame.
+  // TODO(creis): Is this frame ID trusted?  Which frame is it for?
+  //DCHECK_EQ(frame_tree_node_->GetID()?, pending_nav_params_->frame_id);
+
   // Now that the unload handler has run, we need to either initiate the
   // pending transfer (if there is one) or resume the paused response (if not).
   // TODO(creis): The blank swapped out page is visible during this time, but
@@ -260,6 +290,7 @@ void RenderViewHostManager::SwappedOut(RenderViewHost* render_view_host) {
     // We don't know whether the original request had |user_action| set to true.
     // However, since we force the navigation to be in the current tab, it
     // doesn't matter.
+    // TODO(creis): Move RequestTransferURL to RenderFrameHost's navigator.
     render_view_host->GetDelegate()->RequestTransferURL(
         transfer_url,
         pending_nav_params_->transfer_url_chain,
@@ -270,23 +301,76 @@ void RenderViewHostManager::SwappedOut(RenderViewHost* render_view_host) {
         pending_nav_params_->global_request_id,
         false,
         true);
-  } else if (pending_render_view_host_) {
+  } else if (pending_render_frame_host_) {
+    RenderProcessHostImpl* pending_process =
+        static_cast<RenderProcessHostImpl*>(
+            pending_render_frame_host_->GetProcess());
+    pending_process->ResumeDeferredNavigation(
+        pending_nav_params_->global_request_id);
+  }
+  pending_nav_params_.reset();
+}
+
+
+void RenderViewHostManager::SwappedOutFrame(
+    RenderFrameHostImpl* render_frame_host) {
+  // Make sure this is from our current RFH, and that we have a pending
+  // navigation from OnCrossSiteResponse.  (There may be no pending navigation
+  // for data URLs that don't make network requests, for example.)   If not,
+  // just return early and ignore.
+  if (render_frame_host != render_frame_host_ || !pending_nav_params_.get()) {
+    pending_nav_params_.reset();
+    return;
+  }
+
+  // We should probably sanity check that this is for the correct frame.
+  // TODO(creis): Is this frame ID trusted?  Which frame is it for?
+  //DCHECK_EQ(frame_tree_node_->GetID()?, pending_nav_params_->frame_id);
+
+  // Now that the unload handler has run, we need to either initiate the
+  // pending transfer (if there is one) or resume the paused response (if not).
+  // TODO(creis): The blank swapped out page is visible during this time, but
+  // we can shorten this by delivering the response directly, rather than
+  // forcing an identical request to be made.
+  if (pending_nav_params_->is_transfer) {
+    // Treat the last URL in the chain as the destination and the remainder as
+    // the redirect chain.
+    CHECK(pending_nav_params_->transfer_url_chain.size());
+    GURL transfer_url = pending_nav_params_->transfer_url_chain.back();
+    pending_nav_params_->transfer_url_chain.pop_back();
+
+    // We don't know whether the original request had |user_action| set to true.
+    // However, since we force the navigation to be in the current tab, it
+    // doesn't matter.
+    // TODO(creis): Move RequestTransferURL to RenderFrameHost's navigator.
+    render_frame_host->render_view_host()->GetDelegate()->RequestTransferURL(
+        transfer_url,
+        pending_nav_params_->transfer_url_chain,
+        pending_nav_params_->referrer,
+        pending_nav_params_->page_transition,
+        CURRENT_TAB,
+        pending_nav_params_->frame_id,
+        pending_nav_params_->global_request_id,
+        false,
+        true);
+  } else if (pending_render_frame_host_) {
     RenderProcessHostImpl* pending_process =
         static_cast<RenderProcessHostImpl*>(
-            pending_render_view_host_->GetProcess());
+            pending_render_frame_host_->GetProcess());
     pending_process->ResumeDeferredNavigation(
         pending_nav_params_->global_request_id);
   }
   pending_nav_params_.reset();
 }
 
+// TODO(creis): Take in a RenderFrameHost.
 void RenderViewHostManager::DidNavigateMainFrame(
     RenderViewHost* render_view_host) {
   if (!cross_navigation_pending_) {
-    DCHECK(!pending_render_view_host_);
+    DCHECK(!pending_render_frame_host_);
 
     // We should only hear this from our current renderer.
-    DCHECK(render_view_host == render_view_host_);
+    DCHECK(render_view_host == render_frame_host_->render_view_host());
 
     // Even when there is no pending RVH, there may be a pending Web UI.
     if (pending_web_ui())
@@ -294,17 +378,18 @@ void RenderViewHostManager::DidNavigateMainFrame(
     return;
   }
 
-  if (render_view_host == pending_render_view_host_) {
+  if (render_view_host == pending_render_frame_host_->render_view_host()) {
     // The pending cross-site navigation completed, so show the renderer.
     // If it committed without sending network requests (e.g., data URLs),
-    // then we still need to swap out the old RVH first and run its unload
+    // then we still need to swap out the old RFH first and run its unload
     // handler.  OK for that to happen in the background.
-    if (pending_render_view_host_->HasPendingCrossSiteRequest())
+    if (pending_render_frame_host_->render_view_host()->
+            HasPendingCrossSiteRequest())
       SwapOutOldPage();
 
     CommitPending();
     cross_navigation_pending_ = false;
-  } else if (render_view_host == render_view_host_) {
+  } else if (render_view_host == render_frame_host_->render_view_host()) {
     // A navigation in the original page has taken place.  Cancel the pending
     // one.
     CancelPending();
@@ -315,14 +400,15 @@ void RenderViewHostManager::DidNavigateMainFrame(
   }
 }
 
+// TODO(creis): Take in RenderFrameHost instead, since frames can have openers.
 void RenderViewHostManager::DidDisownOpener(RenderViewHost* render_view_host) {
-  // Notify all swapped out hosts, including the pending RVH.
-  for (RenderViewHostMap::iterator iter = swapped_out_hosts_.begin();
+  // Notify all swapped out hosts, including the pending RFH.
+  for (RenderFrameHostMap::iterator iter = swapped_out_hosts_.begin();
        iter != swapped_out_hosts_.end();
        ++iter) {
-    DCHECK_NE(iter->second->GetSiteInstance(),
+    DCHECK_NE(iter->second->render_view_host()->GetSiteInstance(),
               current_host()->GetSiteInstance());
-    iter->second->DisownOpener();
+    iter->second->render_view_host()->DisownOpener();
   }
 }
 
@@ -346,7 +432,7 @@ void RenderViewHostManager::RendererProcessClosing(
   // swap them back in while the process is exiting.  Start by finding them,
   // since there could be more than one.
   std::list<int> ids_to_remove;
-  for (RenderViewHostMap::iterator iter = swapped_out_hosts_.begin();
+  for (RenderFrameHostMap::iterator iter = swapped_out_hosts_.begin();
        iter != swapped_out_hosts_.end();
        ++iter) {
     if (iter->second->GetProcess() == render_process_host)
@@ -355,7 +441,7 @@ void RenderViewHostManager::RendererProcessClosing(
 
   // Now delete them.
   while (!ids_to_remove.empty()) {
-    swapped_out_hosts_[ids_to_remove.back()]->Shutdown();
+    delete swapped_out_hosts_[ids_to_remove.back()];
     swapped_out_hosts_.erase(ids_to_remove.back());
     ids_to_remove.pop_back();
   }
@@ -376,9 +462,11 @@ void RenderViewHostManager::ShouldClosePage(
       // might be because the renderer was deemed unresponsive and this call was
       // already made by ShouldCloseTabOnUnresponsiveRenderer.  In that case, it
       // is ok to do nothing here.
-      if (pending_render_view_host_ &&
-          pending_render_view_host_->are_navigations_suspended()) {
-        pending_render_view_host_->SetNavigationsSuspended(false, proceed_time);
+      if (pending_render_frame_host_ &&
+          pending_render_frame_host_->render_view_host()->
+              are_navigations_suspended()) {
+        pending_render_frame_host_->render_view_host()->
+            SetNavigationsSuspended(false, proceed_time);
       }
     } else {
       // Current page says to cancel.
@@ -392,20 +480,21 @@ void RenderViewHostManager::ShouldClosePage(
                                                   &proceed_to_fire_unload);
 
     if (proceed_to_fire_unload) {
-      // If we're about to close the tab and there's a pending RVH, cancel it.
-      // Otherwise, if the navigation in the pending RVH completes before the
-      // close in the current RVH, we'll lose the tab close.
-      if (pending_render_view_host_) {
+      // If we're about to close the tab and there's a pending RFH, cancel it.
+      // Otherwise, if the navigation in the pending RFH completes before the
+      // close in the current RFH, we'll lose the tab close.
+      if (pending_render_frame_host_) {
         CancelPending();
         cross_navigation_pending_ = false;
       }
 
       // This is not a cross-site navigation, the tab is being closed.
-      render_view_host_->ClosePage();
+      render_frame_host_->render_view_host()->ClosePage();
     }
   }
 }
 
+// TODO(creis): Take in a RenderFrameHost from CSRH.
 void RenderViewHostManager::OnCrossSiteResponse(
     RenderViewHost* pending_render_view_host,
     const GlobalRequestID& global_request_id,
@@ -416,9 +505,9 @@ void RenderViewHostManager::OnCrossSiteResponse(
     int64 frame_id) {
   // This should be called either when the pending RVH is ready to commit or
   // when we realize that the current RVH's request requires a transfer.
-  DCHECK(
-      pending_render_view_host == pending_render_view_host_ ||
-      pending_render_view_host == render_view_host_);
+  DCHECK(pending_render_view_host == render_frame_host_->render_view_host() ||
+         pending_render_view_host ==
+             pending_render_frame_host_->render_view_host());
 
   // TODO(creis): Eventually we will want to check all navigation responses
   // here, but currently we pass information for a transfer if
@@ -440,7 +529,7 @@ void RenderViewHostManager::SwapOutOldPage() {
   // Tell the renderer to suppress any further modal dialogs so that we can swap
   // it out.  This must be done before canceling any current dialog, in case
   // there is a loop creating additional dialogs.
-  render_view_host_->SuppressDialogsUntilSwapOut();
+  render_frame_host_->render_view_host()->SuppressDialogsUntilSwapOut();
 
   // Now close any modal dialogs that would prevent us from swapping out.  This
   // must be done separately from SwapOut, so that the PageGroupLoadDeferrer is
@@ -452,14 +541,21 @@ void RenderViewHostManager::SwapOutOldPage() {
   // unload handler finishes and the navigation completes, we will send a
   // message to the ResourceDispatcherHost, allowing the pending RVH's response
   // to resume.
-  render_view_host_->SwapOut();
+  // Note: this must be done on the RFH or else we'll swap out the
+  // top-level page.
+  if (render_frame_host_->is_main_frame())
+    render_frame_host_->render_view_host()->SwapOut();
+  else
+    render_frame_host_->SwapOut();
 
   // ResourceDispatcherHost has told us to run the onunload handler, which
   // means it is not a download or unsafe page, and we are going to perform the
-  // navigation.  Thus, we no longer need to remember that the RenderViewHost
+  // navigation.  Thus, we no longer need to remember that the RenderFrameHost
   // is part of a pending cross-site request.
-  if (pending_render_view_host_)
-    pending_render_view_host_->SetHasPendingCrossSiteRequest(false);
+  if (pending_render_frame_host_) {
+    pending_render_frame_host_->render_view_host()->
+        SetHasPendingCrossSiteRequest(false);
+  }
 }
 
 void RenderViewHostManager::Observe(
@@ -500,7 +596,7 @@ bool RenderViewHostManager::ShouldSwapProcessesForNavigation(
   // page and one isn't.  If there's no curr_entry, check the current RVH's
   // site, which might already be committed to a Web UI URL (such as the NTP).
   const GURL& current_url = (curr_entry) ? curr_entry->GetURL() :
-      render_view_host_->GetSiteInstance()->GetSiteURL();
+      render_frame_host_->render_view_host()->GetSiteInstance()->GetSiteURL();
   BrowserContext* browser_context =
       delegate_->GetControllerForRenderManager().GetBrowserContext();
   if (WebUIControllerFactoryRegistry::GetInstance()->UseWebUIForURL(
@@ -520,7 +616,7 @@ bool RenderViewHostManager::ShouldSwapProcessesForNavigation(
   }
 
   if (GetContentClient()->browser()->ShouldSwapProcessesForNavigation(
-          render_view_host_->GetSiteInstance(),
+          render_frame_host_->render_view_host()->GetSiteInstance(),
           curr_entry ? curr_entry->GetURL() : GURL(),
           new_entry->GetURL())) {
     return true;
@@ -705,7 +801,7 @@ SiteInstance* RenderViewHostManager::GetSiteInstanceForEntry(
   }
 }
 
-int RenderViewHostManager::CreateRenderView(
+int RenderViewHostManager::CreateRenderFrame(
     SiteInstance* instance,
     int opener_route_id,
     bool swapped_out,
@@ -716,49 +812,57 @@ int RenderViewHostManager::CreateRenderView(
   // Check if we've already created an RVH for this SiteInstance.  If so, try
   // to re-use the existing one, which has already been initialized.  We'll
   // remove it from the list of swapped out hosts if it commits.
-  RenderViewHostImpl* new_render_view_host = static_cast<RenderViewHostImpl*>(
-      GetSwappedOutRenderViewHost(instance));
-  if (new_render_view_host) {
+  RenderFrameHostImpl* new_render_frame_host =
+      GetSwappedOutRenderFrameHost(instance);
+  if (new_render_frame_host) {
     // Prevent the process from exiting while we're trying to use it.
     if (!swapped_out)
-      new_render_view_host->GetProcess()->AddPendingView();
+      new_render_frame_host->GetProcess()->AddPendingView();
   } else {
-    // Create a new RenderViewHost if we don't find an existing one.
-    new_render_view_host = static_cast<RenderViewHostImpl*>(
-        RenderViewHostFactory::Create(instance,
-                                      render_view_delegate_,
-                                      render_widget_delegate_,
-                                      MSG_ROUTING_NONE,
-                                      MSG_ROUTING_NONE,
-                                      swapped_out,
-                                      hidden));
-
-    // If the new RVH is swapped out already, store it.  Otherwise prevent the
+    // Create a new RenderFrameHost if we don't find an existing one.  Start
+    // by finding or creating a RenderViewHost for it if needed.
+    FrameTree* frame_tree = render_view_delegate_->GetFrameTree();
+    int frame_routing_id = instance->GetProcess()->GetNextRoutingID();
+    RenderViewHostImpl* render_view_host =
+        frame_tree->GetRenderViewHostForNewFrame(instance, MSG_ROUTING_NONE,
+                                                 frame_routing_id,
+                                                 swapped_out, hidden);
+    new_render_frame_host = new RenderFrameHostImpl(render_view_host,
+                                                    frame_tree,
+                                                    frame_tree_node_,
+                                                    frame_routing_id,
+                                                    swapped_out);
+
+    // If the new RFH is swapped out already, store it.  Otherwise prevent the
     // process from exiting while we're trying to navigate in it.
     if (swapped_out) {
-      swapped_out_hosts_[instance->GetId()] = new_render_view_host;
+      swapped_out_hosts_[instance->GetId()] = new_render_frame_host;
     } else {
-      new_render_view_host->GetProcess()->AddPendingView();
+      new_render_frame_host->GetProcess()->AddPendingView();
     }
 
-    bool success = InitRenderView(new_render_view_host, opener_route_id);
+    bool success = InitRenderView(render_view_host, opener_route_id);
     if (success) {
       // Don't show the view until we get a DidNavigate from it.
-      new_render_view_host->GetView()->Hide();
+      render_view_host->GetView()->Hide();
     } else if (!swapped_out) {
       CancelPending();
     }
   }
 
-  // Use this as our new pending RVH if it isn't swapped out.
+  // Use this as our new pending RFH if it isn't swapped out.
   if (!swapped_out)
-    pending_render_view_host_ = new_render_view_host;
+    pending_render_frame_host_ = new_render_frame_host;
 
-  return new_render_view_host->GetRoutingID();
+  return new_render_frame_host->render_view_host()->GetRoutingID();
 }
 
 bool RenderViewHostManager::InitRenderView(RenderViewHost* render_view_host,
                                            int opener_route_id) {
+  // We may have initialized this RenderView for another RenderFrameHost.
+  if (render_view_host->IsRenderViewLive())
+    return true;
+
   // If the pending navigation is to a WebUI and the RenderView is not in a
   // guest process, tell the RenderView about any bindings it will need enabled.
   if (pending_web_ui() && !render_view_host->GetProcess()->IsGuest())
@@ -784,10 +888,10 @@ void RenderViewHostManager::CommitPending() {
   else if (!pending_and_current_web_ui_.get())
     web_ui_.reset();
 
-  // It's possible for the pending_render_view_host_ to be NULL when we aren't
+  // It's possible for the pending_render_frame_host_ to be NULL when we aren't
   // crossing process boundaries. If so, we just needed to handle the Web UI
   // committing above and we're done.
-  if (!pending_render_view_host_) {
+  if (!pending_render_frame_host_) {
     if (will_focus_location_bar)
       delegate_->SetFocusToLocationBar(false);
     return;
@@ -796,90 +900,119 @@ void RenderViewHostManager::CommitPending() {
   // Remember if the page was focused so we can focus the new renderer in
   // that case.
   bool focus_render_view = !will_focus_location_bar &&
-      render_view_host_->GetView() && render_view_host_->GetView()->HasFocus();
+      render_frame_host_->render_view_host()->GetView() &&
+      render_frame_host_->render_view_host()->GetView()->HasFocus();
 
-  // Swap in the pending view and make it active. Also ensure the FrameTree
-  // stays in sync.
-  RenderViewHostImpl* old_render_view_host = render_view_host_;
-  render_view_host_ = pending_render_view_host_;
-  pending_render_view_host_ = NULL;
-  render_view_host_->AttachToFrameTree();
+  // Swap in the pending frame and make it active.
+  RenderFrameHostImpl* old_render_frame_host = render_frame_host_;
+  render_frame_host_ = pending_render_frame_host_;
+  pending_render_frame_host_ = NULL;
 
   // The process will no longer try to exit, so we can decrement the count.
-  render_view_host_->GetProcess()->RemovePendingView();
+  render_frame_host_->GetProcess()->RemovePendingView();
+
+  // TODO(creis): As long as show/hide are on RVH, we don't want to do them for
+  // subframe navigations or they'll interfere with the top-level page.
+  bool is_subframe =
+      render_view_delegate_->GetFrameTree()->root()->render_manager() != this;
 
   // If the view is gone, then this RenderViewHost died while it was hidden.
   // We ignored the RenderProcessGone call at the time, so we should send it now
   // to make sure the sad tab shows up, etc.
-  if (!render_view_host_->GetView())
-    delegate_->RenderProcessGoneFromRenderManager(render_view_host_);
-  else if (!delegate_->IsHidden())
-    render_view_host_->GetView()->Show();
+  if (!render_frame_host_->render_view_host()->GetView()) {
+    delegate_->RenderProcessGoneFromRenderManager(
+        render_frame_host_->render_view_host());
+  } else if (!delegate_->IsHidden() && !is_subframe) {
+    render_frame_host_->render_view_host()->GetView()->Show();
+  }
 
   // Hide the old view now that the new one is visible.
-  if (old_render_view_host->GetView()) {
-    old_render_view_host->GetView()->Hide();
-    old_render_view_host->WasSwappedOut();
+  // TODO(creis): We don't want to hide the top-level view based on a frame
+  // swap.  Hack for now.
+  if (old_render_frame_host->render_view_host()->GetView()) {
+    if (!is_subframe) {
+      old_render_frame_host->render_view_host()->GetView()->Hide();
+      old_render_frame_host->render_view_host()->WasSwappedOut();
+    } else {
+      // TODO(creis): We'll need to set this back to false when navigating a
+      // subframe RFH, but we can't navigate a subframe RFH yet.
+      old_render_frame_host->set_swapped_out(true);
+    }
   }
 
   // Make sure the size is up to date.  (Fix for bug 1079768.)
   delegate_->UpdateRenderViewSizeForRenderManager();
 
-  if (will_focus_location_bar)
+  if (will_focus_location_bar) {
     delegate_->SetFocusToLocationBar(false);
-  else if (focus_render_view && render_view_host_->GetView())
-    RenderWidgetHostViewPort::FromRWHV(render_view_host_->GetView())->Focus();
+  } else if (focus_render_view &&
+             render_frame_host_->render_view_host()->GetView()) {
+    RenderWidgetHostViewPort::FromRWHV(
+        render_frame_host_->render_view_host()->GetView())->Focus();
+  }
 
-  // Notify that we've swapped RenderViewHosts. We do this
-  // before shutting down the RVH so that we can clean up
-  // RendererResources related to the RVH first.
-  delegate_->NotifySwappedFromRenderManager(old_render_view_host,
-                                            render_view_host_);
+  // Notify that we've swapped RenderFrameHosts. We do this
+  // before shutting down the RFH so that we can clean up
+  // RendererResources related to the RFH first.
+  // TODO(creis): Only do this on top-level RFHs for now, and later
+  // update it to pass the RFHs.
+  if (!is_subframe) {
+    delegate_->NotifySwappedFromRenderManager(
+        old_render_frame_host->render_view_host(),
+       render_frame_host_->render_view_host());
+  }
 
-  // If the pending view was on the swapped out list, we can remove it.
-  swapped_out_hosts_.erase(render_view_host_->GetSiteInstance()->GetId());
+  // If the pending frame was on the swapped out list, we can remove it.
+  swapped_out_hosts_.erase(render_frame_host_->render_view_host()->
+                               GetSiteInstance()->GetId());
 
-  // If there are no active RVHs in this SiteInstance, it means that
-  // this RVH was the last active one in the SiteInstance. Now that we
-  // know that all RVHs are swapped out, we can delete all the RVHs in
+  // If there are no active RFHs in this SiteInstance, it means that
+  // this RFH was the last active one in the SiteInstance. Now that we
+  // know that all RFHs are swapped out, we can delete all the RFHs in
   // this SiteInstance.
-  if (!static_cast<SiteInstanceImpl*>(old_render_view_host->GetSiteInstance())->
-          active_view_count()) {
-    ShutdownRenderViewHostsInSiteInstance(
-        old_render_view_host->GetSiteInstance()->GetId());
-    // This is deleted while cleaning up the SitaInstance's views.
-    old_render_view_host = NULL;
-  } else if (old_render_view_host->IsRenderViewLive()) {
+  // TODO(creis): the ShutdownRFHs call doesn't work until we can iterate over
+  // all RFHs.  Let's skip it for now and just swap out like we used to.
+  /*if (!static_cast<SiteInstanceImpl*>(
+          old_render_frame_host->render_view_host()->GetSiteInstance())->
+              active_view_count()) {
+    ShutdownRenderFrameHostsInSiteInstance(
+        old_render_frame_host->render_view_host()->GetSiteInstance()->GetId());
+    // This is deleted while cleaning up the SiteInstance's views.
+    old_render_frame_host = NULL;
+  } else*/
+  if (old_render_frame_host->render_view_host()->IsRenderViewLive()) {
     // If the old RVH is live, we are swapping it out and should keep track of
     // it in case we navigate back to it.
-    DCHECK(old_render_view_host->is_swapped_out());
+    DCHECK(old_render_frame_host->is_swapped_out() ||
+           old_render_frame_host->render_view_host()->is_swapped_out());
     // Temp fix for http://crbug.com/90867 until we do a better cleanup to make
     // sure we don't get different rvh instances for the same site instance
     // in the same rvhmgr.
     // TODO(creis): Clean this up.
     int32 old_site_instance_id =
-        old_render_view_host->GetSiteInstance()->GetId();
-    RenderViewHostMap::iterator iter =
+        old_render_frame_host->render_view_host()->GetSiteInstance()->GetId();
+    RenderFrameHostMap::iterator iter =
         swapped_out_hosts_.find(old_site_instance_id);
     if (iter != swapped_out_hosts_.end() &&
-        iter->second != old_render_view_host) {
-      // Shutdown the RVH that will be replaced in the map to avoid a leak.
-      iter->second->Shutdown();
+        iter->second != old_render_frame_host) {
+      // Delete the RFH that will be replaced in the map to avoid a leak.
+      delete iter->second;
     }
-    swapped_out_hosts_[old_site_instance_id] = old_render_view_host;
+    swapped_out_hosts_[old_site_instance_id] = old_render_frame_host;
   } else {
-    old_render_view_host->Shutdown();
-    old_render_view_host = NULL;  // Shutdown() deletes it.
+    delete old_render_frame_host;
   }
 }
 
-void RenderViewHostManager::ShutdownRenderViewHostsInSiteInstance(
+void RenderViewHostManager::ShutdownRenderFrameHostsInSiteInstance(
     int32 site_instance_id) {
-  // First remove any swapped out RVH for this SiteInstance from our
+  // First remove any swapped out RFH for this SiteInstance from our
   // list.
   swapped_out_hosts_.erase(site_instance_id);
 
-  scoped_ptr<RenderWidgetHostIterator> widgets(
+  // TODO(creis): We can't iterate over widgets to find all frames.
+  // Must have another way to find all RFHs in the SiteInstance.
+  /*scoped_ptr<RenderWidgetHostIterator> widgets(
       RenderWidgetHostImpl::GetAllRenderWidgetHosts());
   while (RenderWidgetHost* widget = widgets->GetNextHost()) {
     if (!widget->IsRenderView())
@@ -888,22 +1021,23 @@ void RenderViewHostManager::ShutdownRenderViewHostsInSiteInstance(
         static_cast<RenderViewHostImpl*>(RenderViewHost::From(widget));
     if (site_instance_id == rvh->GetSiteInstance()->GetId())
       rvh->Shutdown();
-  }
+  }*/
 }
 
-RenderViewHostImpl* RenderViewHostManager::UpdateRendererStateForNavigate(
+RenderFrameHostImpl* RenderViewHostManager::UpdateRendererStateForNavigate(
     const NavigationEntryImpl& entry) {
   // If we are cross-navigating, then we want to get back to normal and navigate
   // as usual.
   if (cross_navigation_pending_) {
-    if (pending_render_view_host_)
+    if (pending_render_frame_host_)
       CancelPending();
     cross_navigation_pending_ = false;
   }
 
-  // render_view_host_ will not be deleted before the end of this method, so we
+  // render_frame_host_ will not be deleted before the end of this method, so we
   // don't have to worry about this SiteInstance's ref count dropping to zero.
-  SiteInstance* curr_instance = render_view_host_->GetSiteInstance();
+  SiteInstance* curr_instance =
+      render_frame_host_->render_view_host()->GetSiteInstance();
 
   // Determine if we need a new SiteInstance for this entry.
   // Again, new_instance won't be deleted before the end of this method, so it
@@ -939,13 +1073,13 @@ RenderViewHostImpl* RenderViewHostManager::UpdateRendererStateForNavigate(
 
     // Create a non-swapped-out pending RVH with the given opener and navigate
     // it.
-    int route_id = CreateRenderView(new_instance, opener_route_id, false,
-                                    delegate_->IsHidden());
+    int route_id = CreateRenderFrame(new_instance, opener_route_id, false,
+                                     delegate_->IsHidden());
     if (route_id == MSG_ROUTING_NONE)
       return NULL;
 
     // Check if our current RVH is live before we set up a transition.
-    if (!render_view_host_->IsRenderViewLive()) {
+    if (!render_frame_host_->render_view_host()->IsRenderViewLive()) {
       if (!cross_navigation_pending_) {
         // The current RVH is not live.  There's no reason to sit around with a
         // sad tab or a newly created RVH while we wait for the pending RVH to
@@ -953,10 +1087,10 @@ RenderViewHostImpl* RenderViewHostManager::UpdateRendererStateForNavigate(
         // cross-navigating (Note that we don't care about on{before}unload
         // handlers if the current RVH isn't live.)
         CommitPending();
-        return render_view_host_;
+        return render_frame_host_;
       } else {
         NOTREACHED();
-        return render_view_host_;
+        return render_frame_host_;
       }
     }
     // Otherwise, it's safe to treat this as a pending cross-site transition.
@@ -967,7 +1101,8 @@ RenderViewHostImpl* RenderViewHostManager::UpdateRendererStateForNavigate(
     // Navigate message) until we hear back from the old renderer's
     // beforeunload handler.  If the handler returns false, we'll have to
     // cancel the request.
-    DCHECK(!pending_render_view_host_->are_navigations_suspended());
+    DCHECK(!pending_render_frame_host_->render_view_host()->
+               are_navigations_suspended());
     bool is_transfer =
         entry.transferred_global_request_id() != GlobalRequestID();
     if (is_transfer) {
@@ -979,19 +1114,21 @@ RenderViewHostImpl* RenderViewHostManager::UpdateRendererStateForNavigate(
       // Also make sure the old render view stops, in case a load is in
       // progress.  (We don't want to do this for transfers, since it will
       // interrupt the transfer with an unexpected DidStopLoading.)
-      render_view_host_->Send(
-          new ViewMsg_Stop(render_view_host_->GetRoutingID()));
+      render_frame_host_->render_view_host()->Send(new ViewMsg_Stop(
+          render_frame_host_->render_view_host()->GetRoutingID()));
 
-      pending_render_view_host_->SetNavigationsSuspended(true,
-                                                         base::TimeTicks());
+      pending_render_frame_host_->render_view_host()->
+          SetNavigationsSuspended(true, base::TimeTicks());
 
       // Tell the CrossSiteRequestManager that this RVH has a pending cross-site
       // request, so that ResourceDispatcherHost will know to tell us to run the
       // old page's unload handler before it sends the response.
-      pending_render_view_host_->SetHasPendingCrossSiteRequest(true);
+      // TODO(creis): This needs to be on the RFH.
+      pending_render_frame_host_->render_view_host()->
+          SetHasPendingCrossSiteRequest(true);
     }
 
-    // We now have a pending RVH.
+    // We now have a pending RFH.
     DCHECK(!cross_navigation_pending_);
     cross_navigation_pending_ = true;
 
@@ -1000,9 +1137,9 @@ RenderViewHostImpl* RenderViewHostManager::UpdateRendererStateForNavigate(
     // doesn't otherwise know that the cross-site request is happening.  This
     // will trigger a call to ShouldClosePage with the reply.
     if (!is_transfer)
-      render_view_host_->FirePageBeforeUnload(true);
+      render_frame_host_->render_view_host()->FirePageBeforeUnload(true);
 
-    return pending_render_view_host_;
+    return pending_render_frame_host_;
   } else {
     if (ShouldReuseWebUI(curr_entry, &entry)) {
       pending_web_ui_.reset();
@@ -1011,50 +1148,57 @@ RenderViewHostImpl* RenderViewHostManager::UpdateRendererStateForNavigate(
       SetPendingWebUI(entry);
 
       // Make sure the new RenderViewHost has the right bindings.
-      if (pending_web_ui() && !render_view_host_->GetProcess()->IsGuest())
-        render_view_host_->AllowBindings(pending_web_ui()->GetBindings());
+      if (pending_web_ui() && !render_frame_host_->GetProcess()->IsGuest()) {
+        render_frame_host_->render_view_host()->AllowBindings(
+            pending_web_ui()->GetBindings());
+      }
     }
 
-    if (pending_web_ui() && render_view_host_->IsRenderViewLive())
-      pending_web_ui()->GetController()->RenderViewReused(render_view_host_);
+    if (pending_web_ui() &&
+        render_frame_host_->render_view_host()->IsRenderViewLive()) {
+      pending_web_ui()->GetController()->RenderViewReused(
+          render_frame_host_->render_view_host());
+    }
 
     // The renderer can exit view source mode when any error or cancellation
     // happen. We must overwrite to recover the mode.
     if (entry.IsViewSourceMode()) {
-      render_view_host_->Send(
-          new ViewMsg_EnableViewSourceMode(render_view_host_->GetRoutingID()));
+      render_frame_host_->render_view_host()->Send(
+          new ViewMsg_EnableViewSourceMode(
+              render_frame_host_->render_view_host()->GetRoutingID()));
     }
   }
 
-  // Same SiteInstance can be used.  Navigate render_view_host_ if we are not
+  // Same SiteInstance can be used.  Navigate render_frame_host_ if we are not
   // cross navigating.
   DCHECK(!cross_navigation_pending_);
-  return render_view_host_;
+  return render_frame_host_;
 }
 
 void RenderViewHostManager::CancelPending() {
-  RenderViewHostImpl* pending_render_view_host = pending_render_view_host_;
-  pending_render_view_host_ = NULL;
+  RenderFrameHostImpl* pending_render_frame_host = pending_render_frame_host_;
+  pending_render_frame_host_ = NULL;
 
   RenderViewDevToolsAgentHost::OnCancelPendingNavigation(
-      pending_render_view_host,
-      render_view_host_);
+      pending_render_frame_host->render_view_host(),
+      render_frame_host_->render_view_host());
 
   // We no longer need to prevent the process from exiting.
-  pending_render_view_host->GetProcess()->RemovePendingView();
+  pending_render_frame_host->GetProcess()->RemovePendingView();
 
-  // The pending RVH may already be on the swapped out list if we started to
+  // The pending RFH may already be on the swapped out list if we started to
   // swap it back in and then canceled.  If so, make sure it gets swapped out
   // again.  If it's not on the swapped out list (e.g., aborting a pending
   // load), then it's safe to shut down.
-  if (IsOnSwappedOutList(pending_render_view_host)) {
+  if (IsOnSwappedOutList(pending_render_frame_host)) {
     // Any currently suspended navigations are no longer needed.
-    pending_render_view_host->CancelSuspendedNavigations();
+    pending_render_frame_host->render_view_host()->CancelSuspendedNavigations();
 
-    pending_render_view_host->SwapOut();
+    // TODO(creis): We need to swap out the RFH.
+    pending_render_frame_host->render_view_host()->SwapOut();
   } else {
     // We won't be coming back, so shut this one down.
-    pending_render_view_host->Shutdown();
+    delete pending_render_frame_host;
   }
 
   pending_web_ui_.reset();
@@ -1062,48 +1206,70 @@ void RenderViewHostManager::CancelPending() {
 }
 
 void RenderViewHostManager::RenderViewDeleted(RenderViewHost* rvh) {
+  // Make sure deleted RVHs are not kept in the swapped out list while we are
+  // still alive.  (If render_frame_host_ is null, we're already being deleted.)
+  if (!render_frame_host_)
+    return;
+
   // We are doing this in order to work around and to track a crasher
-  // (http://crbug.com/23411) where it seems that pending_render_view_host_ is
+  // (http://crbug.com/23411) where it seems that pending_render_frame_host_ is
   // deleted (not sure from where) but not NULLed.
-  if (rvh == pending_render_view_host_) {
+  if (pending_render_frame_host_ &&
+      rvh == pending_render_frame_host_->render_view_host()) {
     // If you hit this NOTREACHED, please report it in the following bug
     // http://crbug.com/23411 Make sure to include what you were doing when it
     // happened  (navigating to a new page, closing a tab...) and if you can
     // reproduce.
     NOTREACHED();
-    pending_render_view_host_ = NULL;
+    // TODO(creis): Remove all this (or remove all RFHs that it affects).
+    pending_render_frame_host_ = NULL;
   }
 
-  // Make sure deleted RVHs are not kept in the swapped out list while we are
-  // still alive.  (If render_view_host_ is null, we're already being deleted.)
-  if (!render_view_host_)
-    return;
   // We can't look it up by SiteInstance ID, which may no longer be valid.
-  for (RenderViewHostMap::iterator iter = swapped_out_hosts_.begin();
+  for (RenderFrameHostMap::iterator iter = swapped_out_hosts_.begin();
        iter != swapped_out_hosts_.end();
        ++iter) {
-    if (iter->second == rvh) {
+    if (iter->second->render_view_host() == rvh) {
       swapped_out_hosts_.erase(iter);
       break;
     }
   }
 }
 
-bool RenderViewHostManager::IsOnSwappedOutList(RenderViewHost* rvh) const {
-  if (!rvh->GetSiteInstance())
+bool RenderViewHostManager::IsRVHOnSwappedOutList(
+    RenderViewHostImpl* rvh) const {
+  RenderFrameHostImpl* render_frame_host = GetSwappedOutRenderFrameHost(
+      rvh->GetSiteInstance());
+  if (!render_frame_host)
+    return false;
+  return IsOnSwappedOutList(render_frame_host);
+}
+
+bool RenderViewHostManager::IsOnSwappedOutList(RenderFrameHostImpl* rfh) const {
+  if (!rfh->render_view_host()->GetSiteInstance())
     return false;
 
-  RenderViewHostMap::const_iterator iter = swapped_out_hosts_.find(
-      rvh->GetSiteInstance()->GetId());
+  RenderFrameHostMap::const_iterator iter = swapped_out_hosts_.find(
+      rfh->render_view_host()->GetSiteInstance()->GetId());
   if (iter == swapped_out_hosts_.end())
     return false;
 
-  return iter->second == rvh;
+  return iter->second == rfh;
 }
 
 RenderViewHostImpl* RenderViewHostManager::GetSwappedOutRenderViewHost(
-    SiteInstance* instance) {
-  RenderViewHostMap::iterator iter = swapped_out_hosts_.find(instance->GetId());
+    SiteInstance* instance) const {
+  RenderFrameHostImpl* render_frame_host =
+      GetSwappedOutRenderFrameHost(instance);
+  if (render_frame_host)
+    return render_frame_host->render_view_host();
+  return NULL;
+}
+
+RenderFrameHostImpl* RenderViewHostManager::GetSwappedOutRenderFrameHost(
+    SiteInstance* instance) const {
+  RenderFrameHostMap::const_iterator iter =
+      swapped_out_hosts_.find(instance->GetId());
   if (iter != swapped_out_hosts_.end())
     return iter->second;