Move navigation and frame tree classes to a new frame_host/ directory.

content/browser/web_contents/render_view_host_manager.cc

-// 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.
-
-#include "content/browser/web_contents/render_view_host_manager.h"
-
-#include <utility>
-
-#include "base/command_line.h"
-#include "base/debug/trace_event.h"
-#include "base/logging.h"
-#include "content/browser/devtools/render_view_devtools_agent_host.h"
-#include "content/browser/renderer_host/render_process_host_impl.h"
-#include "content/browser/renderer_host/render_view_host_factory.h"
-#include "content/browser/renderer_host/render_view_host_impl.h"
-#include "content/browser/site_instance_impl.h"
-#include "content/browser/web_contents/interstitial_page_impl.h"
-#include "content/browser/web_contents/navigation_controller_impl.h"
-#include "content/browser/web_contents/navigation_entry_impl.h"
-#include "content/browser/webui/web_ui_controller_factory_registry.h"
-#include "content/browser/webui/web_ui_impl.h"
-#include "content/common/view_messages.h"
-#include "content/port/browser/render_widget_host_view_port.h"
-#include "content/public/browser/content_browser_client.h"
-#include "content/public/browser/notification_service.h"
-#include "content/public/browser/notification_types.h"
-#include "content/public/browser/render_widget_host_iterator.h"
-#include "content/public/browser/user_metrics.h"
-#include "content/public/browser/web_contents_view.h"
-#include "content/public/browser/web_ui_controller.h"
-#include "content/public/common/content_switches.h"
-#include "content/public/common/url_constants.h"
-
-namespace content {
-
-RenderViewHostManager::PendingNavigationParams::PendingNavigationParams()
-    : is_transfer(false), frame_id(-1) {
-}
-
-RenderViewHostManager::PendingNavigationParams::PendingNavigationParams(
-    const GlobalRequestID& global_request_id,
-    bool is_transfer,
-    const GURL& transfer_url,
-    Referrer referrer,
-    int64 frame_id)
-    : global_request_id(global_request_id),
-      is_transfer(is_transfer),
-      transfer_url(transfer_url),
-      referrer(referrer),
-      frame_id(frame_id) {
-}
-
-RenderViewHostManager::RenderViewHostManager(
-    RenderViewHostDelegate* render_view_delegate,
-    RenderWidgetHostDelegate* render_widget_delegate,
-    Delegate* delegate)
-    : 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),
-      interstitial_page_(NULL) {
-}
-
-RenderViewHostManager::~RenderViewHostManager() {
-  if (pending_render_view_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();
-
-  // Shut down any swapped out RenderViewHosts.
-  for (RenderViewHostMap::iterator iter = swapped_out_hosts_.begin();
-       iter != swapped_out_hosts_.end();
-       ++iter) {
-    iter->second->Shutdown();
-  }
-}
-
-void RenderViewHostManager::Init(BrowserContext* browser_context,
-                                 SiteInstance* site_instance,
-                                 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.
-  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();
-
-  // Keep track of renderer processes as they start to shut down or are
-  // crashed/killed.
-  registrar_.Add(this, NOTIFICATION_RENDERER_PROCESS_CLOSED,
-                 NotificationService::AllSources());
-  registrar_.Add(this, NOTIFICATION_RENDERER_PROCESS_CLOSING,
-                 NotificationService::AllSources());
-}
-
-RenderViewHostImpl* RenderViewHostManager::current_host() const {
-  return render_view_host_;
-}
-
-RenderViewHostImpl* RenderViewHostManager::pending_render_view_host() const {
-  return pending_render_view_host_;
-}
-
-RenderWidgetHostView* RenderViewHostManager::GetRenderWidgetHostView() const {
-  if (interstitial_page_)
-    return interstitial_page_->GetView();
-  if (!render_view_host_)
-    return NULL;
-  return render_view_host_->GetView();
-}
-
-void RenderViewHostManager::SetPendingWebUI(const NavigationEntryImpl& entry) {
-  pending_web_ui_.reset(
-      delegate_->CreateWebUIForRenderManager(entry.GetURL()));
-  pending_and_current_web_ui_.reset();
-
-  // If we have assigned (zero or more) bindings to this NavigationEntry in the
-  // past, make sure we're not granting it different bindings than it had
-  // before.  If so, note it and don't give it any bindings, to avoid a
-  // potential privilege escalation.
-  if (pending_web_ui_.get() &&
-      entry.bindings() != NavigationEntryImpl::kInvalidBindings &&
-      pending_web_ui_->GetBindings() != entry.bindings()) {
-    RecordAction(UserMetricsAction("ProcessSwapBindingsMismatch_RVHM"));
-    pending_web_ui_.reset();
-  }
-}
-
-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
-  // its first page.  (Bug 1145340)
-  if (dest_render_view_host != render_view_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);
-  }
-
-  // If the renderer crashed, then try to create a new one to satisfy this
-  // navigation request.
-  if (!dest_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))
-      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();
-    } 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_);
-    }
-  }
-
-  return dest_render_view_host;
-}
-
-void RenderViewHostManager::Stop() {
-  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()));
-  }
-}
-
-void RenderViewHostManager::SetIsLoading(bool is_loading) {
-  render_view_host_->SetIsLoading(is_loading);
-  if (pending_render_view_host_)
-    pending_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
-  // in progress.  Sanity check this for http://crbug.com/276333.
-  CHECK(pending_render_view_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 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()) {
-    // 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(
-          false, base::TimeTicks::Now());
-  }
-  return false;
-}
-
-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()) {
-    pending_nav_params_.reset();
-    return;
-  }
-
-  // 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) {
-    // 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.
-    render_view_host->GetDelegate()->RequestTransferURL(
-        pending_nav_params_->transfer_url,
-        pending_nav_params_->referrer,
-        CURRENT_TAB,
-        pending_nav_params_->frame_id,
-        pending_nav_params_->global_request_id,
-        false,
-        true);
-  } else if (pending_render_view_host_) {
-    RenderProcessHostImpl* pending_process =
-        static_cast<RenderProcessHostImpl*>(
-            pending_render_view_host_->GetProcess());
-    pending_process->ResumeDeferredNavigation(
-        pending_nav_params_->global_request_id);
-  }
-  pending_nav_params_.reset();
-}
-
-void RenderViewHostManager::DidNavigateMainFrame(
-    RenderViewHost* render_view_host) {
-  if (!cross_navigation_pending_) {
-    DCHECK(!pending_render_view_host_);
-
-    // We should only hear this from our current renderer.
-    DCHECK(render_view_host == render_view_host_);
-
-    // Even when there is no pending RVH, there may be a pending Web UI.
-    if (pending_web_ui())
-      CommitPending();
-    return;
-  }
-
-  if (render_view_host == pending_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
-    // handler.  OK for that to happen in the background.
-    if (pending_render_view_host_->HasPendingCrossSiteRequest())
-      SwapOutOldPage();
-
-    CommitPending();
-    cross_navigation_pending_ = false;
-  } else if (render_view_host == render_view_host_) {
-    // A navigation in the original page has taken place.  Cancel the pending
-    // one.
-    CancelPending();
-    cross_navigation_pending_ = false;
-  } else {
-    // No one else should be sending us DidNavigate in this state.
-    DCHECK(false);
-  }
-}
-
-void RenderViewHostManager::DidDisownOpener(RenderViewHost* render_view_host) {
-  // Notify all swapped out hosts, including the pending RVH.
-  for (RenderViewHostMap::iterator iter = swapped_out_hosts_.begin();
-       iter != swapped_out_hosts_.end();
-       ++iter) {
-    DCHECK_NE(iter->second->GetSiteInstance(),
-              current_host()->GetSiteInstance());
-    iter->second->DisownOpener();
-  }
-}
-
-void RenderViewHostManager::RendererAbortedProvisionalLoad(
-    RenderViewHost* render_view_host) {
-  // We used to cancel the pending renderer here for cross-site downloads.
-  // However, it's not safe to do that because the download logic repeatedly
-  // looks for this WebContents based on a render view ID.  Instead, we just
-  // leave the pending renderer around until the next navigation event
-  // (Navigate, DidNavigate, etc), which will clean it up properly.
-  // TODO(creis): All of this will go away when we move the cross-site logic
-  // to ResourceDispatcherHost, so that we intercept responses rather than
-  // navigation events.  (That's necessary to support onunload anyway.)  Once
-  // we've made that change, we won't create a pending renderer until we know
-  // the response is not a download.
-}
-
-void RenderViewHostManager::RendererProcessClosing(
-    RenderProcessHost* render_process_host) {
-  // Remove any swapped out RVHs from this process, so that we don't try to
-  // 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();
-       iter != swapped_out_hosts_.end();
-       ++iter) {
-    if (iter->second->GetProcess() == render_process_host)
-      ids_to_remove.push_back(iter->first);
-  }
-
-  // Now delete them.
-  while (!ids_to_remove.empty()) {
-    swapped_out_hosts_[ids_to_remove.back()]->Shutdown();
-    swapped_out_hosts_.erase(ids_to_remove.back());
-    ids_to_remove.pop_back();
-  }
-}
-
-void RenderViewHostManager::ShouldClosePage(
-    bool for_cross_site_transition,
-    bool proceed,
-    const base::TimeTicks& proceed_time) {
-  if (for_cross_site_transition) {
-    // Ignore if we're not in a cross-site navigation.
-    if (!cross_navigation_pending_)
-      return;
-
-    if (proceed) {
-      // Ok to unload the current page, so proceed with the cross-site
-      // navigation.  Note that if navigations are not currently suspended, it
-      // 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);
-      }
-    } else {
-      // Current page says to cancel.
-      CancelPending();
-      cross_navigation_pending_ = false;
-    }
-  } else {
-    // Non-cross site transition means closing the entire tab.
-    bool proceed_to_fire_unload;
-    delegate_->BeforeUnloadFiredFromRenderManager(proceed, proceed_time,
-                                                  &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_) {
-        CancelPending();
-        cross_navigation_pending_ = false;
-      }
-
-      // This is not a cross-site navigation, the tab is being closed.
-      render_view_host_->ClosePage();
-    }
-  }
-}
-
-void RenderViewHostManager::OnCrossSiteResponse(
-    RenderViewHost* pending_render_view_host,
-    const GlobalRequestID& global_request_id,
-    bool is_transfer,
-    const GURL& transfer_url,
-    const Referrer& referrer,
-    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_);
-
-  // TODO(creis): Eventually we will want to check all navigation responses
-  // here, but currently we pass information for a transfer if
-  // ShouldSwapProcessesForRedirect returned true in the network stack.
-  // In that case, we should set up a transfer after the unload handler runs.
-  // If is_transfer is false, we will just run the unload handler and resume.
-  pending_nav_params_.reset(new PendingNavigationParams(
-      global_request_id, is_transfer, transfer_url, referrer, frame_id));
-
-  // Run the unload handler of the current page.
-  SwapOutOldPage();
-}
-
-void RenderViewHostManager::SwapOutOldPage() {
-  // Should only see this while we have a pending renderer or transfer.
-  CHECK(cross_navigation_pending_ || pending_nav_params_.get());
-
-  // First close any modal dialogs that would prevent us from swapping out.
-  delegate_->CancelModalDialogsForRenderManager();
-
-  // Tell the old renderer it is being swapped out.  This will fire the unload
-  // handler (without firing the beforeunload handler a second time).  When the
-  // 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();
-
-  // 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
-  // is part of a pending cross-site request.
-  if (pending_render_view_host_)
-    pending_render_view_host_->SetHasPendingCrossSiteRequest(false);
-}
-
-void RenderViewHostManager::Observe(
-    int type,
-    const NotificationSource& source,
-    const NotificationDetails& details) {
-  switch (type) {
-    case NOTIFICATION_RENDERER_PROCESS_CLOSED:
-    case NOTIFICATION_RENDERER_PROCESS_CLOSING:
-      RendererProcessClosing(
-          Source<RenderProcessHost>(source).ptr());
-      break;
-
-    default:
-      NOTREACHED();
-  }
-}
-
-bool RenderViewHostManager::ShouldTransitionCrossSite() {
-  // False in the single-process mode, as it makes RVHs to accumulate
-  // in swapped_out_hosts_.
-  // True if we are using process-per-site-instance (default) or
-  // process-per-site (kProcessPerSite).
-  return
-      !CommandLine::ForCurrentProcess()->HasSwitch(switches::kSingleProcess) &&
-      !CommandLine::ForCurrentProcess()->HasSwitch(switches::kProcessPerTab);
-}
-
-bool RenderViewHostManager::ShouldSwapProcessesForNavigation(
-    const NavigationEntry* curr_entry,
-    const NavigationEntryImpl* new_entry) const {
-  DCHECK(new_entry);
-
-  // Check for reasons to swap processes even if we are in a process model that
-  // doesn't usually swap (e.g., process-per-tab).
-
-  // For security, we should transition between processes when one is a Web UI
-  // 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();
-  BrowserContext* browser_context =
-      delegate_->GetControllerForRenderManager().GetBrowserContext();
-  if (WebUIControllerFactoryRegistry::GetInstance()->UseWebUIForURL(
-          browser_context, current_url)) {
-    // Force swap if it's not an acceptable URL for Web UI.
-    // Here, data URLs are never allowed.
-    if (!WebUIControllerFactoryRegistry::GetInstance()->IsURLAcceptableForWebUI(
-            browser_context, new_entry->GetURL(), false)) {
-      return true;
-    }
-  } else {
-    // Force swap if it's a Web UI URL.
-    if (WebUIControllerFactoryRegistry::GetInstance()->UseWebUIForURL(
-            browser_context, new_entry->GetURL())) {
-      return true;
-    }
-  }
-
-  if (GetContentClient()->browser()->ShouldSwapProcessesForNavigation(
-          render_view_host_->GetSiteInstance(),
-          curr_entry ? curr_entry->GetURL() : GURL(),
-          new_entry->GetURL())) {
-    return true;
-  }
-
-  if (!curr_entry)
-    return false;
-
-  // We can't switch a RenderView between view source and non-view source mode
-  // without screwing up the session history sometimes (when navigating between
-  // "view-source:http://foo.com/" and "http://foo.com/", WebKit doesn't treat
-  // it as a new navigation). So require a view switch.
-  if (curr_entry->IsViewSourceMode() != new_entry->IsViewSourceMode())
-    return true;
-
-  return false;
-}
-
-bool RenderViewHostManager::ShouldReuseWebUI(
-    const NavigationEntry* curr_entry,
-    const NavigationEntryImpl* new_entry) const {
-  NavigationControllerImpl& controller =
-      delegate_->GetControllerForRenderManager();
-  return curr_entry && web_ui_.get() &&
-      (WebUIControllerFactoryRegistry::GetInstance()->GetWebUIType(
-          controller.GetBrowserContext(), curr_entry->GetURL()) ==
-       WebUIControllerFactoryRegistry::GetInstance()->GetWebUIType(
-          controller.GetBrowserContext(), new_entry->GetURL()));
-}
-
-SiteInstance* RenderViewHostManager::GetSiteInstanceForEntry(
-    const NavigationEntryImpl& entry,
-    SiteInstance* curr_instance) {
-  // NOTE: This is only called when ShouldTransitionCrossSite is true.
-
-  const GURL& dest_url = entry.GetURL();
-  NavigationControllerImpl& controller =
-      delegate_->GetControllerForRenderManager();
-  BrowserContext* browser_context = controller.GetBrowserContext();
-
-  // If the entry has an instance already we should use it.
-  if (entry.site_instance())
-    return entry.site_instance();
-
-  // (UGLY) HEURISTIC, process-per-site only:
-  //
-  // If this navigation is generated, then it probably corresponds to a search
-  // query.  Given that search results typically lead to users navigating to
-  // other sites, we don't really want to use the search engine hostname to
-  // determine the site instance for this navigation.
-  //
-  // NOTE: This can be removed once we have a way to transition between
-  //       RenderViews in response to a link click.
-  //
-  if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kProcessPerSite) &&
-      PageTransitionCoreTypeIs(entry.GetTransitionType(),
-                               PAGE_TRANSITION_GENERATED)) {
-    return curr_instance;
-  }
-
-  SiteInstanceImpl* curr_site_instance =
-      static_cast<SiteInstanceImpl*>(curr_instance);
-
-  // If we haven't used our SiteInstance (and thus RVH) yet, then we can use it
-  // for this entry.  We won't commit the SiteInstance to this site until the
-  // navigation commits (in DidNavigate), unless the navigation entry was
-  // restored or it's a Web UI as described below.
-  if (!curr_site_instance->HasSite()) {
-    // If we've already created a SiteInstance for our destination, we don't
-    // want to use this unused SiteInstance; use the existing one.  (We don't
-    // do this check if the curr_instance has a site, because for now, we want
-    // to compare against the current URL and not the SiteInstance's site.  In
-    // this case, there is no current URL, so comparing against the site is ok.
-    // See additional comments below.)
-    //
-    // Also, if the URL should use process-per-site mode and there is an
-    // existing process for the site, we should use it.  We can call
-    // GetRelatedSiteInstance() for this, which will eagerly set the site and
-    // thus use the correct process.
-    bool use_process_per_site =
-        RenderProcessHost::ShouldUseProcessPerSite(browser_context, dest_url) &&
-        RenderProcessHostImpl::GetProcessHostForSite(browser_context, dest_url);
-    if (curr_site_instance->HasRelatedSiteInstance(dest_url) ||
-        use_process_per_site) {
-      return curr_site_instance->GetRelatedSiteInstance(dest_url);
-    }
-
-    // For extensions, Web UI URLs (such as the new tab page), and apps we do
-    // not want to use the curr_instance if it has no site, since it will have a
-    // RenderProcessHost of PRIV_NORMAL.  Create a new SiteInstance for this
-    // URL instead (with the correct process type).
-    if (curr_site_instance->HasWrongProcessForURL(dest_url))
-      return curr_site_instance->GetRelatedSiteInstance(dest_url);
-
-    // View-source URLs must use a new SiteInstance and BrowsingInstance.
-    // TODO(nasko): This is the same condition as later in the function. This
-    // should be taken into account when refactoring this method as part of
-    // http://crbug.com/123007.
-    if (entry.IsViewSourceMode())
-      return SiteInstance::CreateForURL(browser_context, dest_url);
-
-    // If we are navigating from a blank SiteInstance to a WebUI, make sure we
-    // create a new SiteInstance.
-    if (WebUIControllerFactoryRegistry::GetInstance()->UseWebUIForURL(
-            browser_context, dest_url)) {
-        return SiteInstance::CreateForURL(browser_context, dest_url);
-    }
-
-    // Normally the "site" on the SiteInstance is set lazily when the load
-    // actually commits. This is to support better process sharing in case
-    // the site redirects to some other site: we want to use the destination
-    // site in the site instance.
-    //
-    // In the case of session restore, as it loads all the pages immediately
-    // we need to set the site first, otherwise after a restore none of the
-    // pages would share renderers in process-per-site.
-    if (entry.restore_type() != NavigationEntryImpl::RESTORE_NONE)
-      curr_site_instance->SetSite(dest_url);
-
-    return curr_site_instance;
-  }
-
-  // Otherwise, only create a new SiteInstance for cross-site navigation.
-
-  // TODO(creis): Once we intercept links and script-based navigations, we
-  // will be able to enforce that all entries in a SiteInstance actually have
-  // the same site, and it will be safe to compare the URL against the
-  // SiteInstance's site, as follows:
-  // const GURL& current_url = curr_instance->site();
-  // For now, though, we're in a hybrid model where you only switch
-  // SiteInstances if you type in a cross-site URL.  This means we have to
-  // compare the entry's URL to the last committed entry's URL.
-  NavigationEntry* curr_entry = controller.GetLastCommittedEntry();
-  if (interstitial_page_) {
-    // The interstitial is currently the last committed entry, but we want to
-    // compare against the last non-interstitial entry.
-    curr_entry = controller.GetEntryAtOffset(-1);
-  }
-  // If there is no last non-interstitial entry (and curr_instance already
-  // has a site), then we must have been opened from another tab.  We want
-  // to compare against the URL of the page that opened us, but we can't
-  // get to it directly.  The best we can do is check against the site of
-  // the SiteInstance.  This will be correct when we intercept links and
-  // script-based navigations, but for now, it could place some pages in a
-  // new process unnecessarily.  We should only hit this case if a page tries
-  // to open a new tab to an interstitial-inducing URL, and then navigates
-  // the page to a different same-site URL.  (This seems very unlikely in
-  // practice.)
-  const GURL& current_url = (curr_entry) ? curr_entry->GetURL() :
-      curr_instance->GetSiteURL();
-
-  // View-source URLs must use a new SiteInstance and BrowsingInstance.
-  // TODO(creis): Refactor this method so this duplicated code isn't needed.
-  // See http://crbug.com/123007.
-  if (curr_entry &&
-      curr_entry->IsViewSourceMode() != entry.IsViewSourceMode()) {
-    return SiteInstance::CreateForURL(browser_context, dest_url);
-  }
-
-  // Use the current SiteInstance for same site navigations, as long as the
-  // process type is correct.  (The URL may have been installed as an app since
-  // the last time we visited it.)
-  if (SiteInstance::IsSameWebSite(browser_context, current_url, dest_url) &&
-      !static_cast<SiteInstanceImpl*>(curr_instance)->HasWrongProcessForURL(
-          dest_url)) {
-    return curr_instance;
-  } else if (ShouldSwapProcessesForNavigation(curr_entry, &entry)) {
-    // When we're swapping, we need to force the site instance AND browsing
-    // instance to be different ones. This addresses special cases where we use
-    // a single BrowsingInstance for all pages of a certain type (e.g., New Tab
-    // Pages), keeping them in the same process. When you navigate away from
-    // that page, we want to explicity ignore that BrowsingInstance and group
-    // this page into the appropriate SiteInstance for its URL.
-    return SiteInstance::CreateForURL(browser_context, dest_url);
-  } else {
-    // Start the new renderer in a new SiteInstance, but in the current
-    // BrowsingInstance.  It is important to immediately give this new
-    // SiteInstance to a RenderViewHost (if it is different than our current
-    // SiteInstance), so that it is ref counted.  This will happen in
-    // CreateRenderView.
-    return curr_instance->GetRelatedSiteInstance(dest_url);
-  }
-}
-
-int RenderViewHostManager::CreateRenderView(
-    SiteInstance* instance,
-    int opener_route_id,
-    bool swapped_out,
-    bool hidden) {
-  CHECK(instance);
-  DCHECK(!swapped_out || hidden); // Swapped out views should always be hidden.
-
-  // 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) {
-    // Prevent the process from exiting while we're trying to use it.
-    if (!swapped_out)
-      new_render_view_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
-    // process from exiting while we're trying to navigate in it.
-    if (swapped_out) {
-      swapped_out_hosts_[instance->GetId()] = new_render_view_host;
-    } else {
-      new_render_view_host->GetProcess()->AddPendingView();
-    }
-
-    bool success = InitRenderView(new_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();
-    } else if (!swapped_out) {
-      CancelPending();
-    }
-  }
-
-  // Use this as our new pending RVH if it isn't swapped out.
-  if (!swapped_out)
-    pending_render_view_host_ = new_render_view_host;
-
-  return new_render_view_host->GetRoutingID();
-}
-
-bool RenderViewHostManager::InitRenderView(RenderViewHost* render_view_host,
-                                           int opener_route_id) {
-  // 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())
-    render_view_host->AllowBindings(pending_web_ui()->GetBindings());
-
-  return delegate_->CreateRenderViewForRenderManager(render_view_host,
-                                                     opener_route_id);
-}
-
-void RenderViewHostManager::CommitPending() {
-  // First check whether we're going to want to focus the location bar after
-  // this commit.  We do this now because the navigation hasn't formally
-  // committed yet, so if we've already cleared |pending_web_ui_| the call chain
-  // this triggers won't be able to figure out what's going on.
-  bool will_focus_location_bar = delegate_->FocusLocationBarByDefault();
-
-  // Next commit the Web UI, if any. Either replace |web_ui_| with
-  // |pending_web_ui_|, or clear |web_ui_| if there is no pending WebUI, or
-  // leave |web_ui_| as is if reusing it.
-  DCHECK(!(pending_web_ui_.get() && pending_and_current_web_ui_.get()));
-  if (pending_web_ui_)
-    web_ui_.reset(pending_web_ui_.release());
-  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
-  // 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 (will_focus_location_bar)
-      delegate_->SetFocusToLocationBar(false);
-    return;
-  }
-
-  // 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();
-
-  // 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();
-
-  // The process will no longer try to exit, so we can decrement the count.
-  render_view_host_->GetProcess()->RemovePendingView();
-
-  // 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();
-
-  // 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();
-  }
-
-  // Make sure the size is up to date.  (Fix for bug 1079768.)
-  delegate_->UpdateRenderViewSizeForRenderManager();
-
-  if (will_focus_location_bar)
-    delegate_->SetFocusToLocationBar(false);
-  else if (focus_render_view && render_view_host_->GetView())
-    RenderWidgetHostViewPort::FromRWHV(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_);
-
-  // If the pending view was on the swapped out list, we can remove it.
-  swapped_out_hosts_.erase(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
-  // 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()) {
-    // 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());
-    // 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 =
-        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();
-    }
-    swapped_out_hosts_[old_site_instance_id] = old_render_view_host;
-  } else {
-    old_render_view_host->Shutdown();
-    old_render_view_host = NULL;  // Shutdown() deletes it.
-  }
-}
-
-void RenderViewHostManager::ShutdownRenderViewHostsInSiteInstance(
-    int32 site_instance_id) {
-  // First remove any swapped out RVH for this SiteInstance from our
-  // list.
-  swapped_out_hosts_.erase(site_instance_id);
-
-  scoped_ptr<RenderWidgetHostIterator> widgets(
-      RenderWidgetHostImpl::GetAllRenderWidgetHosts());
-  while (RenderWidgetHost* widget = widgets->GetNextHost()) {
-    if (!widget->IsRenderView())
-      continue;
-    RenderViewHostImpl* rvh =
-        static_cast<RenderViewHostImpl*>(RenderViewHost::From(widget));
-    if (site_instance_id == rvh->GetSiteInstance()->GetId())
-      rvh->Shutdown();
-  }
-}
-
-RenderViewHostImpl* 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_)
-      CancelPending();
-    cross_navigation_pending_ = false;
-  }
-
-  // render_view_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();
-
-  // 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
-  // is safe to use a normal pointer here.
-  SiteInstance* new_instance = curr_instance;
-  const NavigationEntry* curr_entry =
-      delegate_->GetLastCommittedNavigationEntryForRenderManager();
-  bool is_guest_scheme = curr_instance->GetSiteURL().SchemeIs(kGuestScheme);
-  bool force_swap = ShouldSwapProcessesForNavigation(curr_entry, &entry);
-  if (!is_guest_scheme && (ShouldTransitionCrossSite() || force_swap))
-    new_instance = GetSiteInstanceForEntry(entry, curr_instance);
-
-  if (!is_guest_scheme && (new_instance != curr_instance || force_swap)) {
-    // New SiteInstance.
-    DCHECK(!cross_navigation_pending_);
-
-    // This will possibly create (set to NULL) a Web UI object for the pending
-    // page. We'll use this later to give the page special access. This must
-    // happen before the new renderer is created below so it will get bindings.
-    // It must also happen after the above conditional call to CancelPending(),
-    // otherwise CancelPending may clear the pending_web_ui_ and the page will
-    // not have its bindings set appropriately.
-    SetPendingWebUI(entry);
-
-    // Ensure that we have created RVHs for the new RVH's opener chain if
-    // we are staying in the same BrowsingInstance. This allows the pending RVH
-    // to send cross-process script calls to its opener(s).
-    int opener_route_id = MSG_ROUTING_NONE;
-    if (new_instance->IsRelatedSiteInstance(curr_instance)) {
-      opener_route_id =
-          delegate_->CreateOpenerRenderViewsForRenderManager(new_instance);
-    }
-
-    // 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());
-    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 (!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
-        // navigate.  Just switch to the pending RVH now and go back to non
-        // 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_;
-      } else {
-        NOTREACHED();
-        return render_view_host_;
-      }
-    }
-    // Otherwise, it's safe to treat this as a pending cross-site transition.
-
-    // We need to wait until the beforeunload handler has run, unless we are
-    // transferring an existing request (in which case it has already run).
-    // Suspend the new render view (i.e., don't let it send the cross-site
-    // 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());
-    bool is_transfer =
-        entry.transferred_global_request_id() != GlobalRequestID();
-    if (is_transfer) {
-      // We don't need to stop the old renderer or run beforeunload/unload
-      // handlers, because those have already been done.
-      DCHECK(pending_nav_params_->global_request_id ==
-                entry.transferred_global_request_id());
-    } else {
-      // 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()));
-
-      pending_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);
-    }
-
-    // We now have a pending RVH.
-    DCHECK(!cross_navigation_pending_);
-    cross_navigation_pending_ = true;
-
-    // Unless we are transferring an existing request, we should now
-    // tell the old render view to run its beforeunload handler, since it
-    // 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);
-
-    return pending_render_view_host_;
-  } else {
-    if (ShouldReuseWebUI(curr_entry, &entry)) {
-      pending_web_ui_.reset();
-      pending_and_current_web_ui_ = web_ui_->AsWeakPtr();
-    } else {
-      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_view_host_->IsRenderViewLive())
-      pending_web_ui()->GetController()->RenderViewReused(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()));
-    }
-  }
-
-  // Same SiteInstance can be used.  Navigate render_view_host_ if we are not
-  // cross navigating.
-  DCHECK(!cross_navigation_pending_);
-  return render_view_host_;
-}
-
-void RenderViewHostManager::CancelPending() {
-  RenderViewHostImpl* pending_render_view_host = pending_render_view_host_;
-  pending_render_view_host_ = NULL;
-
-  RenderViewDevToolsAgentHost::OnCancelPendingNavigation(
-      pending_render_view_host,
-      render_view_host_);
-
-  // We no longer need to prevent the process from exiting.
-  pending_render_view_host->GetProcess()->RemovePendingView();
-
-  // The pending RVH 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)) {
-    // Any currently suspended navigations are no longer needed.
-    pending_render_view_host->CancelSuspendedNavigations();
-
-    pending_render_view_host->SwapOut();
-  } else {
-    // We won't be coming back, so shut this one down.
-    pending_render_view_host->Shutdown();
-  }
-
-  pending_web_ui_.reset();
-  pending_and_current_web_ui_.reset();
-}
-
-void RenderViewHostManager::RenderViewDeleted(RenderViewHost* rvh) {
-  // 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
-  // deleted (not sure from where) but not NULLed.
-  if (rvh == pending_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;
-  }
-
-  // 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();
-       iter != swapped_out_hosts_.end();
-       ++iter) {
-    if (iter->second == rvh) {
-      swapped_out_hosts_.erase(iter);
-      break;
-    }
-  }
-}
-
-bool RenderViewHostManager::IsOnSwappedOutList(RenderViewHost* rvh) const {
-  if (!rvh->GetSiteInstance())
-    return false;
-
-  RenderViewHostMap::const_iterator iter = swapped_out_hosts_.find(
-      rvh->GetSiteInstance()->GetId());
-  if (iter == swapped_out_hosts_.end())
-    return false;
-
-  return iter->second == rvh;
-}
-
-RenderViewHostImpl* RenderViewHostManager::GetSwappedOutRenderViewHost(
-    SiteInstance* instance) {
-  RenderViewHostMap::iterator iter = swapped_out_hosts_.find(instance->GetId());
-  if (iter != swapped_out_hosts_.end())
-    return iter->second;
-
-  return NULL;
-}
-
-}  // namespace content