content/browser/frame_host/navigator_impl.cc

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "content/browser/frame_host/navigator_impl.h"
   6
   7 #include "base/command_line.h"
   8 #include "content/browser/frame_host/frame_tree.h"
   9 #include "content/browser/frame_host/frame_tree_node.h"
  10 #include "content/browser/frame_host/navigation_controller_impl.h"
  11 #include "content/browser/frame_host/navigation_entry_impl.h"
  12 #include "content/browser/frame_host/navigator_delegate.h"
  13 #include "content/browser/frame_host/render_frame_host_impl.h"
  14 #include "content/browser/renderer_host/render_view_host_impl.h"
  15 #include "content/browser/site_instance_impl.h"
  16 #include "content/browser/webui/web_ui_controller_factory_registry.h"
  17 #include "content/browser/webui/web_ui_impl.h"
  18 #include "content/common/frame_messages.h"
  19 #include "content/common/view_messages.h"
  20 #include "content/public/browser/browser_context.h"
  21 #include "content/public/browser/content_browser_client.h"
  22 #include "content/public/browser/global_request_id.h"
  23 #include "content/public/browser/invalidate_type.h"
  24 #include "content/public/browser/navigation_controller.h"
  25 #include "content/public/browser/navigation_details.h"
  26 #include "content/public/browser/page_navigator.h"
  27 #include "content/public/browser/render_view_host.h"
  28 #include "content/public/common/bindings_policy.h"
  29 #include "content/public/common/content_client.h"
  30 #include "content/public/common/content_switches.h"
  31 #include "content/public/common/url_constants.h"
  32 #include "content/public/common/url_utils.h"
  33
  34 namespace content {
  35
  36 namespace {
  37
  38 FrameMsg_Navigate_Type::Value GetNavigationType(
  39     BrowserContext* browser_context, const NavigationEntryImpl& entry,
  40     NavigationController::ReloadType reload_type) {
  41   switch (reload_type) {
  42     case NavigationControllerImpl::RELOAD:
  43       return FrameMsg_Navigate_Type::RELOAD;
  44     case NavigationControllerImpl::RELOAD_IGNORING_CACHE:
  45       return FrameMsg_Navigate_Type::RELOAD_IGNORING_CACHE;
  46     case NavigationControllerImpl::RELOAD_ORIGINAL_REQUEST_URL:
  47       return FrameMsg_Navigate_Type::RELOAD_ORIGINAL_REQUEST_URL;
  48     case NavigationControllerImpl::NO_RELOAD:
  49       break;  // Fall through to rest of function.
  50   }
  51
  52   // |RenderViewImpl::PopulateStateFromPendingNavigationParams| differentiates
  53   // between |RESTORE_WITH_POST| and |RESTORE|.
  54   if (entry.restore_type() ==
  55       NavigationEntryImpl::RESTORE_LAST_SESSION_EXITED_CLEANLY) {
  56     if (entry.GetHasPostData())
  57       return FrameMsg_Navigate_Type::RESTORE_WITH_POST;
  58     return FrameMsg_Navigate_Type::RESTORE;
  59   }
  60
  61   return FrameMsg_Navigate_Type::NORMAL;
  62 }
  63
  64 void MakeNavigateParams(const NavigationEntryImpl& entry,
  65                         const NavigationControllerImpl& controller,
  66                         NavigationController::ReloadType reload_type,
  67                         FrameMsg_Navigate_Params* params) {
  68   params->page_id = entry.GetPageID();
  69   params->should_clear_history_list = entry.should_clear_history_list();
  70   params->should_replace_current_entry = entry.should_replace_entry();
  71   if (entry.should_clear_history_list()) {
  72     // Set the history list related parameters to the same values a
  73     // NavigationController would return before its first navigation. This will
  74     // fully clear the RenderView's view of the session history.
  75     params->pending_history_list_offset = -1;
  76     params->current_history_list_offset = -1;
  77     params->current_history_list_length = 0;
  78   } else {
  79     params->pending_history_list_offset = controller.GetIndexOfEntry(&entry);
  80     params->current_history_list_offset =
  81         controller.GetLastCommittedEntryIndex();
  82     params->current_history_list_length = controller.GetEntryCount();
  83   }
  84   params->url = entry.GetURL();
  85   if (!entry.GetBaseURLForDataURL().is_empty()) {
  86     params->base_url_for_data_url = entry.GetBaseURLForDataURL();
  87     params->history_url_for_data_url = entry.GetVirtualURL();
  88   }
  89   params->referrer = entry.GetReferrer();
  90   params->transition = entry.GetTransitionType();
  91   params->page_state = entry.GetPageState();
  92   params->navigation_type =
  93       GetNavigationType(controller.GetBrowserContext(), entry, reload_type);
  94   params->request_time = base::Time::Now();
  95   params->extra_headers = entry.extra_headers();
  96   params->transferred_request_child_id =
  97       entry.transferred_global_request_id().child_id;
  98   params->transferred_request_request_id =
  99       entry.transferred_global_request_id().request_id;
 100   params->is_overriding_user_agent = entry.GetIsOverridingUserAgent();
 101   // Avoid downloading when in view-source mode.
 102   params->allow_download = !entry.IsViewSourceMode();
 103   params->is_post = entry.GetHasPostData();
 104   if (entry.GetBrowserInitiatedPostData()) {
 105     params->browser_initiated_post_data.assign(
 106         entry.GetBrowserInitiatedPostData()->front(),
 107         entry.GetBrowserInitiatedPostData()->front() +
 108             entry.GetBrowserInitiatedPostData()->size());
 109   }
 110
 111   params->redirects = entry.redirect_chain();
 112
 113   params->can_load_local_resources = entry.GetCanLoadLocalResources();
 114   params->frame_to_navigate = entry.GetFrameToNavigate();
 115 }
 116
 117 RenderFrameHostManager* GetRenderManager(RenderFrameHostImpl* rfh) {
 118   if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kSitePerProcess))
 119     return rfh->frame_tree_node()->render_manager();
 120
 121   return rfh->frame_tree_node()->frame_tree()->root()->render_manager();
 122 }
 123
 124 }  // namespace
 125
 126
 127 NavigatorImpl::NavigatorImpl(
 128     NavigationControllerImpl* navigation_controller,
 129     NavigatorDelegate* delegate)
 130     : controller_(navigation_controller),
 131       delegate_(delegate) {
 132 }
 133
 134 void NavigatorImpl::DidStartProvisionalLoad(
 135     RenderFrameHostImpl* render_frame_host,
 136     int parent_routing_id,
 137     const GURL& url) {
 138   bool is_error_page = (url.spec() == kUnreachableWebDataURL);
 139   bool is_iframe_srcdoc = (url.spec() == kAboutSrcDocURL);
 140   GURL validated_url(url);
 141   RenderProcessHost* render_process_host = render_frame_host->GetProcess();
 142   render_process_host->FilterURL(false, &validated_url);
 143
 144   bool is_main_frame = render_frame_host->frame_tree_node()->IsMainFrame();
 145   NavigationEntryImpl* pending_entry =
 146       NavigationEntryImpl::FromNavigationEntry(controller_->GetPendingEntry());
 147   if (is_main_frame) {
 148     // If there is no browser-initiated pending entry for this navigation and it
 149     // is not for the error URL, create a pending entry using the current
 150     // SiteInstance, and ensure the address bar updates accordingly.  We don't
 151     // know the referrer or extra headers at this point, but the referrer will
 152     // be set properly upon commit.
 153     bool has_browser_initiated_pending_entry = pending_entry &&
 154         !pending_entry->is_renderer_initiated();
 155     if (!has_browser_initiated_pending_entry && !is_error_page) {
 156       NavigationEntryImpl* entry = NavigationEntryImpl::FromNavigationEntry(
 157           controller_->CreateNavigationEntry(validated_url,
 158                                              content::Referrer(),
 159                                              content::PAGE_TRANSITION_LINK,
 160                                              true /* is_renderer_initiated */,
 161                                              std::string(),
 162                                              controller_->GetBrowserContext()));
 163       entry->set_site_instance(
 164           static_cast<SiteInstanceImpl*>(
 165               render_frame_host->render_view_host()->GetSiteInstance()));
 166       // TODO(creis): If there's a pending entry already, find a safe way to
 167       // update it instead of replacing it and copying over things like this.
 168       if (pending_entry) {
 169         entry->set_transferred_global_request_id(
 170             pending_entry->transferred_global_request_id());
 171         entry->set_should_replace_entry(pending_entry->should_replace_entry());
 172         entry->set_redirect_chain(pending_entry->redirect_chain());
 173       }
 174       controller_->SetPendingEntry(entry);
 175       if (delegate_)
 176         delegate_->NotifyChangedNavigationState(content::INVALIDATE_TYPE_URL);
 177     }
 178   }
 179
 180   if (delegate_) {
 181     // Notify the observer about the start of the provisional load.
 182     delegate_->DidStartProvisionalLoad(
 183         render_frame_host, parent_routing_id,
 184         validated_url, is_error_page, is_iframe_srcdoc);
 185   }
 186 }
 187
 188
 189 void NavigatorImpl::DidFailProvisionalLoadWithError(
 190     RenderFrameHostImpl* render_frame_host,
 191     const FrameHostMsg_DidFailProvisionalLoadWithError_Params& params) {
 192   VLOG(1) << "Failed Provisional Load: " << params.url.possibly_invalid_spec()
 193           << ", error_code: " << params.error_code
 194           << ", error_description: " << params.error_description
 195           << ", showing_repost_interstitial: " <<
 196             params.showing_repost_interstitial
 197           << ", frame_id: " << render_frame_host->GetRoutingID();
 198   GURL validated_url(params.url);
 199   RenderProcessHost* render_process_host = render_frame_host->GetProcess();
 200   render_process_host->FilterURL(false, &validated_url);
 201
 202   if (net::ERR_ABORTED == params.error_code) {
 203     // EVIL HACK ALERT! Ignore failed loads when we're showing interstitials.
 204     // This means that the interstitial won't be torn down properly, which is
 205     // bad. But if we have an interstitial, go back to another tab type, and
 206     // then load the same interstitial again, we could end up getting the first
 207     // interstitial's "failed" message (as a result of the cancel) when we're on
 208     // the second one. We can't tell this apart, so we think we're tearing down
 209     // the current page which will cause a crash later on.
 210     //
 211     // http://code.google.com/p/chromium/issues/detail?id=2855
 212     // Because this will not tear down the interstitial properly, if "back" is
 213     // back to another tab type, the interstitial will still be somewhat alive
 214     // in the previous tab type. If you navigate somewhere that activates the
 215     // tab with the interstitial again, you'll see a flash before the new load
 216     // commits of the interstitial page.
 217     FrameTreeNode* root =
 218         render_frame_host->frame_tree_node()->frame_tree()->root();
 219     if (root->render_manager()->interstitial_page() != NULL) {
 220       LOG(WARNING) << "Discarding message during interstitial.";
 221       return;
 222     }
 223
 224     // We used to cancel the pending renderer here for cross-site downloads.
 225     // However, it's not safe to do that because the download logic repeatedly
 226     // looks for this WebContents based on a render ID.  Instead, we just
 227     // leave the pending renderer around until the next navigation event
 228     // (Navigate, DidNavigate, etc), which will clean it up properly.
 229     //
 230     // TODO(creis): Find a way to cancel any pending RFH here.
 231   }
 232
 233   // Do not usually clear the pending entry if one exists, so that the user's
 234   // typed URL is not lost when a navigation fails or is aborted.  However, in
 235   // cases that we don't show the pending entry (e.g., renderer-initiated
 236   // navigations in an existing tab), we don't keep it around.  That prevents
 237   // spoofs on in-page navigations that don't go through
 238   // DidStartProvisionalLoadForFrame.
 239   // In general, we allow the view to clear the pending entry and typed URL if
 240   // the user requests (e.g., hitting Escape with focus in the address bar).
 241   // Note: don't touch the transient entry, since an interstitial may exist.
 242   if (controller_->GetPendingEntry() != controller_->GetVisibleEntry())
 243     controller_->DiscardPendingEntry();
 244
 245   if (delegate_)
 246     delegate_->DidFailProvisionalLoadWithError(render_frame_host, params);
 247 }
 248
 249 void NavigatorImpl::DidFailLoadWithError(
 250     RenderFrameHostImpl* render_frame_host,
 251     const GURL& url,
 252     int error_code,
 253     const base::string16& error_description) {
 254   if (delegate_) {
 255     delegate_->DidFailLoadWithError(
 256         render_frame_host, url, error_code,
 257         error_description);
 258   }
 259 }
 260
 261 void NavigatorImpl::DidRedirectProvisionalLoad(
 262     RenderFrameHostImpl* render_frame_host,
 263     int32 page_id,
 264     const GURL& source_url,
 265     const GURL& target_url) {
 266   // TODO(creis): Remove this method and have the pre-rendering code listen to
 267   // WebContentsObserver::DidGetRedirectForResourceRequest instead.
 268   // See http://crbug.com/78512.
 269   GURL validated_source_url(source_url);
 270   GURL validated_target_url(target_url);
 271   RenderProcessHost* render_process_host = render_frame_host->GetProcess();
 272   render_process_host->FilterURL(false, &validated_source_url);
 273   render_process_host->FilterURL(false, &validated_target_url);
 274   NavigationEntry* entry;
 275   if (page_id == -1) {
 276     entry = controller_->GetPendingEntry();
 277   } else {
 278     entry = controller_->GetEntryWithPageID(
 279         render_frame_host->GetSiteInstance(), page_id);
 280   }
 281   if (!entry || entry->GetURL() != validated_source_url)
 282     return;
 283
 284   if (delegate_) {
 285     delegate_->DidRedirectProvisionalLoad(
 286         render_frame_host, validated_target_url);
 287   }
 288 }
 289
 290 bool NavigatorImpl::NavigateToEntry(
 291     RenderFrameHostImpl* render_frame_host,
 292     const NavigationEntryImpl& entry,
 293     NavigationController::ReloadType reload_type) {
 294   TRACE_EVENT0("browser", "NavigatorImpl::NavigateToEntry");
 295
 296   // The renderer will reject IPC messages with URLs longer than
 297   // this limit, so don't attempt to navigate with a longer URL.
 298   if (entry.GetURL().spec().size() > GetMaxURLChars()) {
 299     LOG(WARNING) << "Refusing to load URL as it exceeds " << GetMaxURLChars()
 300                  << " characters.";
 301     return false;
 302   }
 303
 304   RenderFrameHostManager* manager =
 305       render_frame_host->frame_tree_node()->render_manager();
 306   RenderFrameHostImpl* dest_render_frame_host = manager->Navigate(entry);
 307   if (!dest_render_frame_host)
 308     return false;  // Unable to create the desired RenderFrameHost.
 309
 310   // Make sure no code called via RFHM::Navigate clears the pending entry.
 311   CHECK_EQ(controller_->GetPendingEntry(), &entry);
 312
 313   // For security, we should never send non-Web-UI URLs to a Web UI renderer.
 314   // Double check that here.
 315   int enabled_bindings =
 316       dest_render_frame_host->render_view_host()->GetEnabledBindings();
 317   bool is_allowed_in_web_ui_renderer =
 318       WebUIControllerFactoryRegistry::GetInstance()->IsURLAcceptableForWebUI(
 319           controller_->GetBrowserContext(), entry.GetURL());
 320   if ((enabled_bindings & BINDINGS_POLICY_WEB_UI) &&
 321       !is_allowed_in_web_ui_renderer) {
 322     // Log the URL to help us diagnose any future failures of this CHECK.
 323     GetContentClient()->SetActiveURL(entry.GetURL());
 324     CHECK(0);
 325   }
 326
 327   // Notify observers that we will navigate in this RenderFrame.
 328   if (delegate_)
 329     delegate_->AboutToNavigateRenderFrame(dest_render_frame_host);
 330
 331   // Used for page load time metrics.
 332   current_load_start_ = base::TimeTicks::Now();
 333
 334   // Navigate in the desired RenderFrameHost.
 335   FrameMsg_Navigate_Params navigate_params;
 336   MakeNavigateParams(entry, *controller_, reload_type, &navigate_params);
 337   dest_render_frame_host->Navigate(navigate_params);
 338
 339   // Make sure no code called via RFH::Navigate clears the pending entry.
 340   CHECK_EQ(controller_->GetPendingEntry(), &entry);
 341
 342   if (entry.GetPageID() == -1) {
 343     // HACK!!  This code suppresses javascript: URLs from being added to
 344     // session history, which is what we want to do for javascript: URLs that
 345     // do not generate content.  What we really need is a message from the
 346     // renderer telling us that a new page was not created.  The same message
 347     // could be used for mailto: URLs and the like.
 348     if (entry.GetURL().SchemeIs(kJavaScriptScheme))
 349       return false;
 350   }
 351
 352   // Notify observers about navigation.
 353   if (delegate_) {
 354     delegate_->DidStartNavigationToPendingEntry(render_frame_host,
 355                                                 entry.GetURL(),
 356                                                 reload_type);
 357   }
 358
 359   return true;
 360 }
 361
 362 bool NavigatorImpl::NavigateToPendingEntry(
 363     RenderFrameHostImpl* render_frame_host,
 364     NavigationController::ReloadType reload_type) {
 365   return NavigateToEntry(
 366       render_frame_host,
 367       *NavigationEntryImpl::FromNavigationEntry(controller_->GetPendingEntry()),
 368       reload_type);
 369 }
 370
 371 base::TimeTicks NavigatorImpl::GetCurrentLoadStart() {
 372   return current_load_start_;
 373 }
 374
 375 void NavigatorImpl::DidNavigate(
 376     RenderFrameHostImpl* render_frame_host,
 377     const FrameHostMsg_DidCommitProvisionalLoad_Params& input_params) {
 378   FrameHostMsg_DidCommitProvisionalLoad_Params params(input_params);
 379   FrameTree* frame_tree = render_frame_host->frame_tree_node()->frame_tree();
 380   bool use_site_per_process =
 381       CommandLine::ForCurrentProcess()->HasSwitch(switches::kSitePerProcess);
 382
 383   if (use_site_per_process) {
 384     // TODO(creis): Until we mirror the frame tree in the subframe's process,
 385     // cross-process subframe navigations happen in a renderer's main frame.
 386     // Correct the transition type here if we know it is for a subframe.
 387     NavigationEntryImpl* pending_entry =
 388         NavigationEntryImpl::FromNavigationEntry(
 389             controller_->GetPendingEntry());
 390     if (!render_frame_host->frame_tree_node()->IsMainFrame() &&
 391         pending_entry &&
 392         pending_entry->frame_tree_node_id() ==
 393             render_frame_host->frame_tree_node()->frame_tree_node_id()) {
 394       params.transition = PAGE_TRANSITION_AUTO_SUBFRAME;
 395     }
 396   }
 397
 398   if (PageTransitionIsMainFrame(params.transition)) {
 399     // When overscroll navigation gesture is enabled, a screenshot of the page
 400     // in its current state is taken so that it can be used during the
 401     // nav-gesture. It is necessary to take the screenshot here, before calling
 402     // RenderFrameHostManager::DidNavigateMainFrame, because that can change
 403     // WebContents::GetRenderViewHost to return the new host, instead of the one
 404     // that may have just been swapped out.
 405     if (delegate_ && delegate_->CanOverscrollContent())
 406       controller_->TakeScreenshot();
 407
 408     if (!use_site_per_process)
 409       frame_tree->root()->render_manager()->DidNavigateFrame(render_frame_host);
 410   }
 411
 412   // When using --site-per-process, we notify the RFHM for all navigations,
 413   // not just main frame navigations.
 414   if (use_site_per_process) {
 415     FrameTreeNode* frame = render_frame_host->frame_tree_node();
 416     frame->render_manager()->DidNavigateFrame(render_frame_host);
 417   }
 418
 419   // Update the site of the SiteInstance if it doesn't have one yet, unless
 420   // assigning a site is not necessary for this URL.  In that case, the
 421   // SiteInstance can still be considered unused until a navigation to a real
 422   // page.
 423   SiteInstanceImpl* site_instance =
 424       static_cast<SiteInstanceImpl*>(render_frame_host->GetSiteInstance());
 425   if (!site_instance->HasSite() &&
 426       ShouldAssignSiteForURL(params.url)) {
 427     site_instance->SetSite(params.url);
 428   }
 429
 430   // Need to update MIME type here because it's referred to in
 431   // UpdateNavigationCommands() called by RendererDidNavigate() to
 432   // determine whether or not to enable the encoding menu.
 433   // It's updated only for the main frame. For a subframe,
 434   // RenderView::UpdateURL does not set params.contents_mime_type.
 435   // (see http://code.google.com/p/chromium/issues/detail?id=2929 )
 436   // TODO(jungshik): Add a test for the encoding menu to avoid
 437   // regressing it again.
 438   // TODO(nasko): Verify the correctness of the above comment, since some of the
 439   // code doesn't exist anymore. Also, move this code in the
 440   // PageTransitionIsMainFrame code block above.
 441   if (PageTransitionIsMainFrame(params.transition) && delegate_)
 442     delegate_->SetMainFrameMimeType(params.contents_mime_type);
 443
 444   LoadCommittedDetails details;
 445   bool did_navigate = controller_->RendererDidNavigate(render_frame_host,
 446                                                        params, &details);
 447
 448   // For now, keep track of each frame's URL in its FrameTreeNode.  This lets
 449   // us estimate our process count for implementing OOP iframes.
 450   // TODO(creis): Remove this when we track which pages commit in each frame.
 451   render_frame_host->frame_tree_node()->set_current_url(params.url);
 452
 453   // Send notification about committed provisional loads. This notification is
 454   // different from the NAV_ENTRY_COMMITTED notification which doesn't include
 455   // the actual URL navigated to and isn't sent for AUTO_SUBFRAME navigations.
 456   if (details.type != NAVIGATION_TYPE_NAV_IGNORE && delegate_) {
 457     // For AUTO_SUBFRAME navigations, an event for the main frame is generated
 458     // that is not recorded in the navigation history. For the purpose of
 459     // tracking navigation events, we treat this event as a sub frame navigation
 460     // event.
 461     bool is_main_frame = did_navigate ? details.is_main_frame : false;
 462     PageTransition transition_type = params.transition;
 463     // Whether or not a page transition was triggered by going backward or
 464     // forward in the history is only stored in the navigation controller's
 465     // entry list.
 466     if (did_navigate &&
 467         (controller_->GetLastCommittedEntry()->GetTransitionType() &
 468             PAGE_TRANSITION_FORWARD_BACK)) {
 469       transition_type = PageTransitionFromInt(
 470           params.transition | PAGE_TRANSITION_FORWARD_BACK);
 471     }
 472
 473     delegate_->DidCommitProvisionalLoad(render_frame_host,
 474                                         params.frame_unique_name,
 475                                         is_main_frame,
 476                                         params.url,
 477                                         transition_type);
 478   }
 479
 480   if (!did_navigate)
 481     return;  // No navigation happened.
 482
 483   // DO NOT ADD MORE STUFF TO THIS FUNCTION! Your component should either listen
 484   // for the appropriate notification (best) or you can add it to
 485   // DidNavigateMainFramePostCommit / DidNavigateAnyFramePostCommit (only if
 486   // necessary, please).
 487
 488   // Run post-commit tasks.
 489   if (delegate_) {
 490     if (details.is_main_frame)
 491       delegate_->DidNavigateMainFramePostCommit(details, params);
 492
 493     delegate_->DidNavigateAnyFramePostCommit(
 494         render_frame_host, details, params);
 495   }
 496 }
 497
 498 bool NavigatorImpl::ShouldAssignSiteForURL(const GURL& url) {
 499   // about:blank should not "use up" a new SiteInstance.  The SiteInstance can
 500   // still be used for a normal web site.
 501   if (url == GURL(kAboutBlankURL))
 502     return false;
 503
 504   // The embedder will then have the opportunity to determine if the URL
 505   // should "use up" the SiteInstance.
 506   return GetContentClient()->browser()->ShouldAssignSiteForURL(url);
 507 }
 508
 509 void NavigatorImpl::RequestOpenURL(
 510     RenderFrameHostImpl* render_frame_host,
 511     const GURL& url,
 512     const Referrer& referrer,
 513     WindowOpenDisposition disposition,
 514     bool should_replace_current_entry,
 515     bool user_gesture) {
 516   SiteInstance* current_site_instance =
 517       GetRenderManager(render_frame_host)->current_frame_host()->
 518           GetSiteInstance();
 519   // If this came from a swapped out RenderViewHost, we only allow the request
 520   // if we are still in the same BrowsingInstance.
 521   if (render_frame_host->render_view_host()->IsSwappedOut() &&
 522       !render_frame_host->GetSiteInstance()->IsRelatedSiteInstance(
 523           current_site_instance)) {
 524     return;
 525   }
 526
 527   // Delegate to RequestTransferURL because this is just the generic
 528   // case where |old_request_id| is empty.
 529   // TODO(creis): Pass the redirect_chain into this method to support client
 530   // redirects.  http://crbug.com/311721.
 531   std::vector<GURL> redirect_chain;
 532   RequestTransferURL(
 533       render_frame_host, url, redirect_chain, referrer, PAGE_TRANSITION_LINK,
 534       disposition, GlobalRequestID(),
 535       should_replace_current_entry, user_gesture);
 536 }
 537
 538 void NavigatorImpl::RequestTransferURL(
 539     RenderFrameHostImpl* render_frame_host,
 540     const GURL& url,
 541     const std::vector<GURL>& redirect_chain,
 542     const Referrer& referrer,
 543     PageTransition page_transition,
 544     WindowOpenDisposition disposition,
 545     const GlobalRequestID& transferred_global_request_id,
 546     bool should_replace_current_entry,
 547     bool user_gesture) {
 548   GURL dest_url(url);
 549   SiteInstance* current_site_instance =
 550       GetRenderManager(render_frame_host)->current_frame_host()->
 551           GetSiteInstance();
 552   if (!GetContentClient()->browser()->ShouldAllowOpenURL(
 553           current_site_instance, url)) {
 554     dest_url = GURL(kAboutBlankURL);
 555   }
 556
 557   int64 frame_tree_node_id = -1;
 558   if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kSitePerProcess)) {
 559     frame_tree_node_id =
 560         render_frame_host->frame_tree_node()->frame_tree_node_id();
 561   }
 562   OpenURLParams params(
 563       dest_url, referrer, frame_tree_node_id, disposition, page_transition,
 564       true /* is_renderer_initiated */);
 565   if (redirect_chain.size() > 0)
 566     params.redirect_chain = redirect_chain;
 567   params.transferred_global_request_id = transferred_global_request_id;
 568   params.should_replace_current_entry = should_replace_current_entry;
 569   params.user_gesture = user_gesture;
 570
 571   if (GetRenderManager(render_frame_host)->web_ui()) {
 572     // Web UI pages sometimes want to override the page transition type for
 573     // link clicks (e.g., so the new tab page can specify AUTO_BOOKMARK for
 574     // automatically generated suggestions).  We don't override other types
 575     // like TYPED because they have different implications (e.g., autocomplete).
 576     if (PageTransitionCoreTypeIs(params.transition, PAGE_TRANSITION_LINK))
 577       params.transition =
 578           GetRenderManager(render_frame_host)->web_ui()->
 579               GetLinkTransitionType();
 580
 581     // Note also that we hide the referrer for Web UI pages. We don't really
 582     // want web sites to see a referrer of "chrome://blah" (and some
 583     // chrome: URLs might have search terms or other stuff we don't want to
 584     // send to the site), so we send no referrer.
 585     params.referrer = Referrer();
 586
 587     // Navigations in Web UI pages count as browser-initiated navigations.
 588     params.is_renderer_initiated = false;
 589   }
 590
 591   if (delegate_)
 592     delegate_->RequestOpenURL(render_frame_host, params);
 593 }
 594
 595 }  // namespace content