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 "base/metrics/histogram.h"
   9 #include "base/time/time.h"
  10 #include "content/browser/frame_host/frame_tree.h"
  11 #include "content/browser/frame_host/frame_tree_node.h"
  12 #include "content/browser/frame_host/navigation_controller_impl.h"
  13 #include "content/browser/frame_host/navigation_entry_impl.h"
  14 #include "content/browser/frame_host/navigation_request.h"
  15 #include "content/browser/frame_host/navigation_request_info.h"
  16 #include "content/browser/frame_host/navigator_delegate.h"
  17 #include "content/browser/frame_host/render_frame_host_impl.h"
  18 #include "content/browser/renderer_host/render_view_host_impl.h"
  19 #include "content/browser/site_instance_impl.h"
  20 #include "content/browser/webui/web_ui_controller_factory_registry.h"
  21 #include "content/browser/webui/web_ui_impl.h"
  22 #include "content/common/frame_messages.h"
  23 #include "content/common/navigation_params.h"
  24 #include "content/common/view_messages.h"
  25 #include "content/public/browser/browser_context.h"
  26 #include "content/public/browser/content_browser_client.h"
  27 #include "content/public/browser/global_request_id.h"
  28 #include "content/public/browser/invalidate_type.h"
  29 #include "content/public/browser/navigation_controller.h"
  30 #include "content/public/browser/navigation_details.h"
  31 #include "content/public/browser/page_navigator.h"
  32 #include "content/public/browser/render_view_host.h"
  33 #include "content/public/browser/stream_handle.h"
  34 #include "content/public/browser/user_metrics.h"
  35 #include "content/public/common/bindings_policy.h"
  36 #include "content/public/common/content_client.h"
  37 #include "content/public/common/content_switches.h"
  38 #include "content/public/common/resource_response.h"
  39 #include "content/public/common/url_constants.h"
  40 #include "content/public/common/url_utils.h"
  41 #include "net/base/net_errors.h"
  42
  43 namespace content {
  44
  45 namespace {
  46
  47 FrameMsg_Navigate_Type::Value GetNavigationType(
  48     BrowserContext* browser_context, const NavigationEntryImpl& entry,
  49     NavigationController::ReloadType reload_type) {
  50   switch (reload_type) {
  51     case NavigationControllerImpl::RELOAD:
  52       return FrameMsg_Navigate_Type::RELOAD;
  53     case NavigationControllerImpl::RELOAD_IGNORING_CACHE:
  54       return FrameMsg_Navigate_Type::RELOAD_IGNORING_CACHE;
  55     case NavigationControllerImpl::RELOAD_ORIGINAL_REQUEST_URL:
  56       return FrameMsg_Navigate_Type::RELOAD_ORIGINAL_REQUEST_URL;
  57     case NavigationControllerImpl::NO_RELOAD:
  58       break;  // Fall through to rest of function.
  59   }
  60
  61   // |RenderViewImpl::PopulateStateFromPendingNavigationParams| differentiates
  62   // between |RESTORE_WITH_POST| and |RESTORE|.
  63   if (entry.restore_type() ==
  64       NavigationEntryImpl::RESTORE_LAST_SESSION_EXITED_CLEANLY) {
  65     if (entry.GetHasPostData())
  66       return FrameMsg_Navigate_Type::RESTORE_WITH_POST;
  67     return FrameMsg_Navigate_Type::RESTORE;
  68   }
  69
  70   return FrameMsg_Navigate_Type::NORMAL;
  71 }
  72
  73 RenderFrameHostManager* GetRenderManager(RenderFrameHostImpl* rfh) {
  74   if (base::CommandLine::ForCurrentProcess()->HasSwitch(
  75           switches::kSitePerProcess))
  76     return rfh->frame_tree_node()->render_manager();
  77
  78   return rfh->frame_tree_node()->frame_tree()->root()->render_manager();
  79 }
  80
  81 }  // namespace
  82
  83 struct NavigatorImpl::NavigationMetricsData {
  84   NavigationMetricsData(base::TimeTicks start_time,
  85                         GURL url,
  86                         NavigationEntryImpl::RestoreType restore_type)
  87       : start_time_(start_time), url_(url) {
  88     is_restoring_from_last_session_ =
  89         (restore_type ==
  90              NavigationEntryImpl::RESTORE_LAST_SESSION_EXITED_CLEANLY ||
  91          restore_type == NavigationEntryImpl::RESTORE_LAST_SESSION_CRASHED);
  92   }
  93
  94   base::TimeTicks start_time_;
  95   GURL url_;
  96   bool is_restoring_from_last_session_;
  97   base::TimeTicks url_job_start_time_;
  98   base::TimeDelta before_unload_delay_;
  99 };
 100
 101 NavigatorImpl::NavigatorImpl(
 102     NavigationControllerImpl* navigation_controller,
 103     NavigatorDelegate* delegate)
 104     : controller_(navigation_controller),
 105       delegate_(delegate) {
 106 }
 107
 108 NavigatorImpl::~NavigatorImpl() {}
 109
 110 NavigatorDelegate* NavigatorImpl::GetDelegate() {
 111   return delegate_;
 112 }
 113
 114 NavigationController* NavigatorImpl::GetController() {
 115   return controller_;
 116 }
 117
 118 void NavigatorImpl::DidStartProvisionalLoad(
 119     RenderFrameHostImpl* render_frame_host,
 120     const GURL& url) {
 121   bool is_error_page = (url.spec() == kUnreachableWebDataURL);
 122   bool is_iframe_srcdoc = (url.spec() == kAboutSrcDocURL);
 123   GURL validated_url(url);
 124   RenderProcessHost* render_process_host = render_frame_host->GetProcess();
 125   render_process_host->FilterURL(false, &validated_url);
 126
 127   bool is_main_frame = render_frame_host->frame_tree_node()->IsMainFrame();
 128   if (is_main_frame && !is_error_page)
 129     DidStartMainFrameNavigation(validated_url,
 130                                 render_frame_host->GetSiteInstance());
 131
 132   if (delegate_) {
 133     // Notify the observer about the start of the provisional load.
 134     delegate_->DidStartProvisionalLoad(
 135         render_frame_host, validated_url, is_error_page, is_iframe_srcdoc);
 136   }
 137 }
 138
 139
 140 void NavigatorImpl::DidFailProvisionalLoadWithError(
 141     RenderFrameHostImpl* render_frame_host,
 142     const FrameHostMsg_DidFailProvisionalLoadWithError_Params& params) {
 143   VLOG(1) << "Failed Provisional Load: " << params.url.possibly_invalid_spec()
 144           << ", error_code: " << params.error_code
 145           << ", error_description: " << params.error_description
 146           << ", showing_repost_interstitial: " <<
 147             params.showing_repost_interstitial
 148           << ", frame_id: " << render_frame_host->GetRoutingID();
 149   GURL validated_url(params.url);
 150   RenderProcessHost* render_process_host = render_frame_host->GetProcess();
 151   render_process_host->FilterURL(false, &validated_url);
 152
 153   if (net::ERR_ABORTED == params.error_code) {
 154     // EVIL HACK ALERT! Ignore failed loads when we're showing interstitials.
 155     // This means that the interstitial won't be torn down properly, which is
 156     // bad. But if we have an interstitial, go back to another tab type, and
 157     // then load the same interstitial again, we could end up getting the first
 158     // interstitial's "failed" message (as a result of the cancel) when we're on
 159     // the second one. We can't tell this apart, so we think we're tearing down
 160     // the current page which will cause a crash later on.
 161     //
 162     // http://code.google.com/p/chromium/issues/detail?id=2855
 163     // Because this will not tear down the interstitial properly, if "back" is
 164     // back to another tab type, the interstitial will still be somewhat alive
 165     // in the previous tab type. If you navigate somewhere that activates the
 166     // tab with the interstitial again, you'll see a flash before the new load
 167     // commits of the interstitial page.
 168     FrameTreeNode* root =
 169         render_frame_host->frame_tree_node()->frame_tree()->root();
 170     if (root->render_manager()->interstitial_page() != NULL) {
 171       LOG(WARNING) << "Discarding message during interstitial.";
 172       return;
 173     }
 174
 175     // We used to cancel the pending renderer here for cross-site downloads.
 176     // However, it's not safe to do that because the download logic repeatedly
 177     // looks for this WebContents based on a render ID.  Instead, we just
 178     // leave the pending renderer around until the next navigation event
 179     // (Navigate, DidNavigate, etc), which will clean it up properly.
 180     //
 181     // TODO(creis): Find a way to cancel any pending RFH here.
 182   }
 183
 184   // We usually clear the pending entry when it fails, so that an arbitrary URL
 185   // isn't left visible above a committed page.  This must be enforced when
 186   // the pending entry isn't visible (e.g., renderer-initiated navigations) to
 187   // prevent URL spoofs for in-page navigations that don't go through
 188   // DidStartProvisionalLoadForFrame.
 189   //
 190   // However, we do preserve the pending entry in some cases, such as on the
 191   // initial navigation of an unmodified blank tab.  We also allow the delegate
 192   // to say when it's safe to leave aborted URLs in the omnibox, to let the user
 193   // edit the URL and try again.  This may be useful in cases that the committed
 194   // page cannot be attacker-controlled.  In these cases, we still allow the
 195   // view to clear the pending entry and typed URL if the user requests
 196   // (e.g., hitting Escape with focus in the address bar).
 197   //
 198   // Note: don't touch the transient entry, since an interstitial may exist.
 199   bool should_preserve_entry = controller_->IsUnmodifiedBlankTab() ||
 200       delegate_->ShouldPreserveAbortedURLs();
 201   if (controller_->GetPendingEntry() != controller_->GetVisibleEntry() ||
 202       !should_preserve_entry) {
 203     controller_->DiscardPendingEntry(true);
 204
 205     // Also force the UI to refresh.
 206     controller_->delegate()->NotifyNavigationStateChanged(INVALIDATE_TYPE_URL);
 207   }
 208
 209   if (delegate_)
 210     delegate_->DidFailProvisionalLoadWithError(render_frame_host, params);
 211 }
 212
 213 void NavigatorImpl::DidFailLoadWithError(
 214     RenderFrameHostImpl* render_frame_host,
 215     const GURL& url,
 216     int error_code,
 217     const base::string16& error_description,
 218     bool was_ignored_by_handler) {
 219   if (delegate_) {
 220     delegate_->DidFailLoadWithError(
 221         render_frame_host, url, error_code,
 222         error_description, was_ignored_by_handler);
 223   }
 224 }
 225
 226 bool NavigatorImpl::NavigateToEntry(
 227     FrameTreeNode* frame_tree_node,
 228     const FrameNavigationEntry& frame_entry,
 229     const NavigationEntryImpl& entry,
 230     NavigationController::ReloadType reload_type,
 231     bool is_same_document_history_load) {
 232   TRACE_EVENT0("browser,navigation", "NavigatorImpl::NavigateToEntry");
 233
 234   GURL dest_url = frame_entry.url();
 235   Referrer dest_referrer = frame_entry.referrer();
 236   if (reload_type ==
 237           NavigationController::ReloadType::RELOAD_ORIGINAL_REQUEST_URL &&
 238       entry.GetOriginalRequestURL().is_valid() && !entry.GetHasPostData()) {
 239     // We may have been redirected when navigating to the current URL.
 240     // Use the URL the user originally intended to visit, if it's valid and if a
 241     // POST wasn't involved; the latter case avoids issues with sending data to
 242     // the wrong page.
 243     dest_url = entry.GetOriginalRequestURL();
 244     dest_referrer = Referrer();
 245   }
 246
 247   // The renderer will reject IPC messages with URLs longer than
 248   // this limit, so don't attempt to navigate with a longer URL.
 249   if (dest_url.spec().size() > GetMaxURLChars()) {
 250     LOG(WARNING) << "Refusing to load URL as it exceeds " << GetMaxURLChars()
 251                  << " characters.";
 252     return false;
 253   }
 254
 255   // This will be used to set the Navigation Timing API navigationStart
 256   // parameter for browser navigations in new tabs (intents, tabs opened through
 257   // "Open link in new tab"). We need to keep it above RFHM::Navigate() call to
 258   // capture the time needed for the RenderFrameHost initialization.
 259   base::TimeTicks navigation_start = base::TimeTicks::Now();
 260
 261   RenderFrameHostManager* manager = frame_tree_node->render_manager();
 262
 263   // PlzNavigate: the RenderFrameHosts are no longer asked to navigate.
 264   if (base::CommandLine::ForCurrentProcess()->HasSwitch(
 265           switches::kEnableBrowserSideNavigation)) {
 266     navigation_data_.reset(new NavigationMetricsData(navigation_start, dest_url,
 267                                                      entry.restore_type()));
 268     RequestNavigation(frame_tree_node, dest_url, dest_referrer, frame_entry,
 269                       entry, reload_type, is_same_document_history_load,
 270                       navigation_start);
 271
 272     // Notify observers about navigation.
 273     if (delegate_)
 274       delegate_->DidStartNavigationToPendingEntry(dest_url, reload_type);
 275
 276     return true;
 277   }
 278
 279   RenderFrameHostImpl* dest_render_frame_host =
 280       manager->Navigate(dest_url, frame_entry, entry);
 281   if (!dest_render_frame_host)
 282     return false;  // Unable to create the desired RenderFrameHost.
 283
 284   // Make sure no code called via RFHM::Navigate clears the pending entry.
 285   CHECK_EQ(controller_->GetPendingEntry(), &entry);
 286
 287   // For security, we should never send non-Web-UI URLs to a Web UI renderer.
 288   // Double check that here.
 289   CheckWebUIRendererDoesNotDisplayNormalURL(dest_render_frame_host, dest_url);
 290
 291   // Notify observers that we will navigate in this RenderFrame.
 292   if (delegate_) {
 293     delegate_->AboutToNavigateRenderFrame(frame_tree_node->current_frame_host(),
 294                                           dest_render_frame_host);
 295   }
 296
 297   // Navigate in the desired RenderFrameHost.
 298   // We can skip this step in the rare case that this is a transfer navigation
 299   // which began in the chosen RenderFrameHost, since the request has already
 300   // been issued.  In that case, simply resume the response.
 301   bool is_transfer_to_same =
 302       entry.transferred_global_request_id().child_id != -1 &&
 303       entry.transferred_global_request_id().child_id ==
 304           dest_render_frame_host->GetProcess()->GetID();
 305   if (!is_transfer_to_same) {
 306     navigation_data_.reset(new NavigationMetricsData(navigation_start, dest_url,
 307                                                      entry.restore_type()));
 308     // Create the navigation parameters.
 309     FrameMsg_Navigate_Type::Value navigation_type =
 310         GetNavigationType(controller_->GetBrowserContext(), entry, reload_type);
 311     dest_render_frame_host->Navigate(
 312         entry.ConstructCommonNavigationParams(dest_url, dest_referrer,
 313                                               frame_entry, navigation_type),
 314         entry.ConstructStartNavigationParams(),
 315         entry.ConstructRequestNavigationParams(
 316             frame_entry, navigation_start, is_same_document_history_load,
 317             frame_tree_node->has_committed_real_load(),
 318             controller_->GetPendingEntryIndex() == -1,
 319             controller_->GetIndexOfEntry(&entry),
 320             controller_->GetLastCommittedEntryIndex(),
 321             controller_->GetEntryCount()));
 322   } else {
 323     // No need to navigate again.  Just resume the deferred request.
 324     dest_render_frame_host->GetProcess()->ResumeDeferredNavigation(
 325         entry.transferred_global_request_id());
 326   }
 327
 328   // Make sure no code called via RFH::Navigate clears the pending entry.
 329   CHECK_EQ(controller_->GetPendingEntry(), &entry);
 330
 331   if (controller_->GetPendingEntryIndex() == -1 &&
 332       dest_url.SchemeIs(url::kJavaScriptScheme)) {
 333     // If the pending entry index is -1 (which means a new navigation rather
 334     // than a history one), and the user typed in a javascript: URL, don't add
 335     // it to the session history.
 336     //
 337     // This is a hack. What we really want is to avoid adding to the history any
 338     // URL that doesn't generate content, and what would be great would be if we
 339     // had a message from the renderer telling us that a new page was not
 340     // created. The same message could be used for mailto: URLs and the like.
 341     return false;
 342   }
 343
 344   // Notify observers about navigation.
 345   if (delegate_) {
 346     delegate_->DidStartNavigationToPendingEntry(dest_url, reload_type);
 347   }
 348
 349   return true;
 350 }
 351
 352 bool NavigatorImpl::NavigateToPendingEntry(
 353     FrameTreeNode* frame_tree_node,
 354     const FrameNavigationEntry& frame_entry,
 355     NavigationController::ReloadType reload_type,
 356     bool is_same_document_history_load) {
 357   return NavigateToEntry(frame_tree_node, frame_entry,
 358                          *controller_->GetPendingEntry(), reload_type,
 359                          is_same_document_history_load);
 360 }
 361
 362 void NavigatorImpl::DidNavigate(
 363     RenderFrameHostImpl* render_frame_host,
 364     const FrameHostMsg_DidCommitProvisionalLoad_Params& input_params) {
 365   FrameHostMsg_DidCommitProvisionalLoad_Params params(input_params);
 366   FrameTree* frame_tree = render_frame_host->frame_tree_node()->frame_tree();
 367   bool use_site_per_process = base::CommandLine::ForCurrentProcess()->HasSwitch(
 368       switches::kSitePerProcess);
 369
 370   if (ui::PageTransitionIsMainFrame(params.transition)) {
 371     if (delegate_) {
 372       // When overscroll navigation gesture is enabled, a screenshot of the page
 373       // in its current state is taken so that it can be used during the
 374       // nav-gesture. It is necessary to take the screenshot here, before
 375       // calling RenderFrameHostManager::DidNavigateMainFrame, because that can
 376       // change WebContents::GetRenderViewHost to return the new host, instead
 377       // of the one that may have just been swapped out.
 378       if (delegate_->CanOverscrollContent()) {
 379         // Don't take screenshots if we are staying on the same page. We want
 380         // in-page navigations to be super fast, and taking a screenshot
 381         // currently blocks GPU for a longer time than we are willing to
 382         // tolerate in this use case.
 383         if (!params.was_within_same_page)
 384           controller_->TakeScreenshot();
 385       }
 386
 387       // Run tasks that must execute just before the commit.
 388       bool is_navigation_within_page = controller_->IsURLInPageNavigation(
 389           params.url, params.was_within_same_page, render_frame_host);
 390       delegate_->DidNavigateMainFramePreCommit(is_navigation_within_page);
 391     }
 392
 393     if (!use_site_per_process)
 394       frame_tree->root()->render_manager()->DidNavigateFrame(
 395           render_frame_host, params.gesture == NavigationGestureUser);
 396   }
 397
 398   // Save the origin of the new page.  Do this before calling
 399   // DidNavigateFrame(), because the origin needs to be included in the SwapOut
 400   // message, which is sent inside DidNavigateFrame().  SwapOut needs the
 401   // origin because it creates a RenderFrameProxy that needs this to initialize
 402   // its security context. This origin will also be sent to RenderFrameProxies
 403   // created via ViewMsg_New and FrameMsg_NewFrameProxy.
 404   render_frame_host->frame_tree_node()->SetCurrentOrigin(params.origin);
 405
 406   // When using --site-per-process, we notify the RFHM for all navigations,
 407   // not just main frame navigations.
 408   if (use_site_per_process) {
 409     FrameTreeNode* frame = render_frame_host->frame_tree_node();
 410     frame->render_manager()->DidNavigateFrame(
 411         render_frame_host, params.gesture == NavigationGestureUser);
 412   }
 413
 414   // Update the site of the SiteInstance if it doesn't have one yet, unless
 415   // assigning a site is not necessary for this URL.  In that case, the
 416   // SiteInstance can still be considered unused until a navigation to a real
 417   // page.
 418   SiteInstanceImpl* site_instance = render_frame_host->GetSiteInstance();
 419   if (!site_instance->HasSite() &&
 420       ShouldAssignSiteForURL(params.url)) {
 421     site_instance->SetSite(params.url);
 422   }
 423
 424   // Need to update MIME type here because it's referred to in
 425   // UpdateNavigationCommands() called by RendererDidNavigate() to
 426   // determine whether or not to enable the encoding menu.
 427   // It's updated only for the main frame. For a subframe,
 428   // RenderView::UpdateURL does not set params.contents_mime_type.
 429   // (see http://code.google.com/p/chromium/issues/detail?id=2929 )
 430   // TODO(jungshik): Add a test for the encoding menu to avoid
 431   // regressing it again.
 432   // TODO(nasko): Verify the correctness of the above comment, since some of the
 433   // code doesn't exist anymore. Also, move this code in the
 434   // PageTransitionIsMainFrame code block above.
 435   if (ui::PageTransitionIsMainFrame(params.transition) && delegate_)
 436     delegate_->SetMainFrameMimeType(params.contents_mime_type);
 437
 438   LoadCommittedDetails details;
 439   bool did_navigate = controller_->RendererDidNavigate(render_frame_host,
 440                                                        params, &details);
 441
 442   // Keep track of each frame's URL in its FrameTreeNode.
 443   render_frame_host->frame_tree_node()->SetCurrentURL(params.url);
 444
 445   // Send notification about committed provisional loads. This notification is
 446   // different from the NAV_ENTRY_COMMITTED notification which doesn't include
 447   // the actual URL navigated to and isn't sent for AUTO_SUBFRAME navigations.
 448   if (details.type != NAVIGATION_TYPE_NAV_IGNORE && delegate_) {
 449     DCHECK_EQ(!render_frame_host->GetParent(),
 450               did_navigate ? details.is_main_frame : false);
 451     ui::PageTransition transition_type = params.transition;
 452     // Whether or not a page transition was triggered by going backward or
 453     // forward in the history is only stored in the navigation controller's
 454     // entry list.
 455     if (did_navigate &&
 456         (controller_->GetLastCommittedEntry()->GetTransitionType() &
 457             ui::PAGE_TRANSITION_FORWARD_BACK)) {
 458       transition_type = ui::PageTransitionFromInt(
 459           params.transition | ui::PAGE_TRANSITION_FORWARD_BACK);
 460     }
 461
 462     delegate_->DidCommitProvisionalLoad(render_frame_host,
 463                                         params.url,
 464                                         transition_type);
 465   }
 466
 467   if (!did_navigate)
 468     return;  // No navigation happened.
 469
 470   // DO NOT ADD MORE STUFF TO THIS FUNCTION! Your component should either listen
 471   // for the appropriate notification (best) or you can add it to
 472   // DidNavigateMainFramePostCommit / DidNavigateAnyFramePostCommit (only if
 473   // necessary, please).
 474
 475   // TODO(carlosk): Move this out when PlzNavigate implementation properly calls
 476   // the observer methods.
 477   RecordNavigationMetrics(details, params, site_instance);
 478
 479   // Run post-commit tasks.
 480   if (delegate_) {
 481     if (details.is_main_frame) {
 482       delegate_->DidNavigateMainFramePostCommit(render_frame_host,
 483                                                 details, params);
 484     }
 485
 486     delegate_->DidNavigateAnyFramePostCommit(
 487         render_frame_host, details, params);
 488   }
 489 }
 490
 491 bool NavigatorImpl::ShouldAssignSiteForURL(const GURL& url) {
 492   // about:blank should not "use up" a new SiteInstance.  The SiteInstance can
 493   // still be used for a normal web site.
 494   if (url == GURL(url::kAboutBlankURL))
 495     return false;
 496
 497   // The embedder will then have the opportunity to determine if the URL
 498   // should "use up" the SiteInstance.
 499   return GetContentClient()->browser()->ShouldAssignSiteForURL(url);
 500 }
 501
 502 void NavigatorImpl::RequestOpenURL(RenderFrameHostImpl* render_frame_host,
 503                                    const GURL& url,
 504                                    SiteInstance* source_site_instance,
 505                                    const Referrer& referrer,
 506                                    WindowOpenDisposition disposition,
 507                                    bool should_replace_current_entry,
 508                                    bool user_gesture) {
 509   SiteInstance* current_site_instance =
 510       GetRenderManager(render_frame_host)->current_frame_host()->
 511           GetSiteInstance();
 512   // If this came from a swapped out RenderFrameHost, we only allow the request
 513   // if we are still in the same BrowsingInstance.
 514   // TODO(creis): Move this to RenderFrameProxyHost::OpenURL.
 515   if (render_frame_host->is_swapped_out() &&
 516       !render_frame_host->GetSiteInstance()->IsRelatedSiteInstance(
 517           current_site_instance)) {
 518     return;
 519   }
 520
 521   // Delegate to RequestTransferURL because this is just the generic
 522   // case where |old_request_id| is empty.
 523   // TODO(creis): Pass the redirect_chain into this method to support client
 524   // redirects.  http://crbug.com/311721.
 525   std::vector<GURL> redirect_chain;
 526   RequestTransferURL(render_frame_host, url, source_site_instance,
 527                      redirect_chain, referrer, ui::PAGE_TRANSITION_LINK,
 528                      disposition, GlobalRequestID(),
 529                      should_replace_current_entry, user_gesture);
 530 }
 531
 532 void NavigatorImpl::RequestTransferURL(
 533     RenderFrameHostImpl* render_frame_host,
 534     const GURL& url,
 535     SiteInstance* source_site_instance,
 536     const std::vector<GURL>& redirect_chain,
 537     const Referrer& referrer,
 538     ui::PageTransition page_transition,
 539     WindowOpenDisposition disposition,
 540     const GlobalRequestID& transferred_global_request_id,
 541     bool should_replace_current_entry,
 542     bool user_gesture) {
 543   GURL dest_url(url);
 544   SiteInstance* current_site_instance =
 545       GetRenderManager(render_frame_host)->current_frame_host()->
 546           GetSiteInstance();
 547   if (!GetContentClient()->browser()->ShouldAllowOpenURL(
 548           current_site_instance, url)) {
 549     dest_url = GURL(url::kAboutBlankURL);
 550   }
 551
 552   int frame_tree_node_id = -1;
 553
 554   // Send the navigation to the current FrameTreeNode if it's destined for a
 555   // subframe in the current tab.  We'll assume it's for the main frame
 556   // (possibly of a new or different WebContents) otherwise.
 557   if (base::CommandLine::ForCurrentProcess()->HasSwitch(
 558           switches::kSitePerProcess) &&
 559       disposition == CURRENT_TAB &&
 560       render_frame_host->GetParent()) {
 561     frame_tree_node_id =
 562         render_frame_host->frame_tree_node()->frame_tree_node_id();
 563   }
 564
 565   OpenURLParams params(
 566       dest_url, referrer, frame_tree_node_id, disposition, page_transition,
 567       true /* is_renderer_initiated */);
 568   params.source_site_instance = source_site_instance;
 569   if (redirect_chain.size() > 0)
 570     params.redirect_chain = redirect_chain;
 571   params.transferred_global_request_id = transferred_global_request_id;
 572   params.should_replace_current_entry = should_replace_current_entry;
 573   params.user_gesture = user_gesture;
 574
 575   if (GetRenderManager(render_frame_host)->web_ui()) {
 576     // Web UI pages sometimes want to override the page transition type for
 577     // link clicks (e.g., so the new tab page can specify AUTO_BOOKMARK for
 578     // automatically generated suggestions).  We don't override other types
 579     // like TYPED because they have different implications (e.g., autocomplete).
 580     if (ui::PageTransitionCoreTypeIs(
 581         params.transition, ui::PAGE_TRANSITION_LINK))
 582       params.transition =
 583           GetRenderManager(render_frame_host)->web_ui()->
 584               GetLinkTransitionType();
 585
 586     // Note also that we hide the referrer for Web UI pages. We don't really
 587     // want web sites to see a referrer of "chrome://blah" (and some
 588     // chrome: URLs might have search terms or other stuff we don't want to
 589     // send to the site), so we send no referrer.
 590     params.referrer = Referrer();
 591
 592     // Navigations in Web UI pages count as browser-initiated navigations.
 593     params.is_renderer_initiated = false;
 594   }
 595
 596   if (delegate_)
 597     delegate_->RequestOpenURL(render_frame_host, params);
 598 }
 599
 600 // PlzNavigate
 601 void NavigatorImpl::OnBeforeUnloadACK(FrameTreeNode* frame_tree_node,
 602                                       bool proceed) {
 603   CHECK(base::CommandLine::ForCurrentProcess()->HasSwitch(
 604       switches::kEnableBrowserSideNavigation));
 605   DCHECK(frame_tree_node);
 606
 607   NavigationRequest* navigation_request = frame_tree_node->navigation_request();
 608
 609   // The NavigationRequest may have been canceled while the renderer was
 610   // executing the BeforeUnload event.
 611   if (!navigation_request)
 612     return;
 613
 614   DCHECK_EQ(NavigationRequest::WAITING_FOR_RENDERER_RESPONSE,
 615             navigation_request->state());
 616
 617   // If the navigation is allowed to proceed, send the request to the IO thread.
 618   if (proceed)
 619     navigation_request->BeginNavigation();
 620   else
 621     CancelNavigation(frame_tree_node);
 622 }
 623
 624 // PlzNavigate
 625 void NavigatorImpl::OnBeginNavigation(
 626     FrameTreeNode* frame_tree_node,
 627     const CommonNavigationParams& common_params,
 628     const BeginNavigationParams& begin_params,
 629     scoped_refptr<ResourceRequestBody> body) {
 630   // TODO(clamy): the url sent by the renderer should be validated with
 631   // FilterURL.
 632   // This is a renderer-initiated navigation.
 633   CHECK(base::CommandLine::ForCurrentProcess()->HasSwitch(
 634       switches::kEnableBrowserSideNavigation));
 635   DCHECK(frame_tree_node);
 636
 637   NavigationRequest* ongoing_navigation_request =
 638       frame_tree_node->navigation_request();
 639
 640   // The renderer-initiated navigation request is ignored iff a) there is an
 641   // ongoing request b) which is browser or user-initiated and c) the renderer
 642   // request is not user-initiated.
 643   if (ongoing_navigation_request &&
 644       (ongoing_navigation_request->browser_initiated() ||
 645        ongoing_navigation_request->begin_params().has_user_gesture) &&
 646       !begin_params.has_user_gesture) {
 647     return;
 648   }
 649
 650   // In all other cases the current navigation, if any, is canceled and a new
 651   // NavigationRequest is created for the node.
 652   frame_tree_node->CreatedNavigationRequest(
 653       NavigationRequest::CreateRendererInitiated(
 654           frame_tree_node, common_params, begin_params, body,
 655           controller_->GetLastCommittedEntryIndex(),
 656           controller_->GetEntryCount()));
 657   NavigationRequest* navigation_request = frame_tree_node->navigation_request();
 658
 659   if (frame_tree_node->IsMainFrame()) {
 660     // Renderer-initiated main-frame navigations that need to swap processes
 661     // will go to the browser via a OpenURL call, and then be handled by the
 662     // same code path as browser-initiated navigations. For renderer-initiated
 663     // main frame navigation that start via a BeginNavigation IPC, the
 664     // RenderFrameHost will not be swapped. Therefore it is safe to call
 665     // DidStartMainFrameNavigation with the SiteInstance from the current
 666     // RenderFrameHost.
 667     DidStartMainFrameNavigation(
 668         common_params.url,
 669         frame_tree_node->current_frame_host()->GetSiteInstance());
 670     navigation_data_.reset();
 671   }
 672
 673   navigation_request->BeginNavigation();
 674 }
 675
 676 // PlzNavigate
 677 void NavigatorImpl::CommitNavigation(FrameTreeNode* frame_tree_node,
 678                                      ResourceResponse* response,
 679                                      scoped_ptr<StreamHandle> body) {
 680   CHECK(base::CommandLine::ForCurrentProcess()->HasSwitch(
 681       switches::kEnableBrowserSideNavigation));
 682
 683   NavigationRequest* navigation_request = frame_tree_node->navigation_request();
 684   DCHECK(navigation_request);
 685   DCHECK(response ||
 686          !ShouldMakeNetworkRequestForURL(
 687              navigation_request->common_params().url));
 688
 689   // HTTP 204 (No Content) and HTTP 205 (Reset Content) responses should not
 690   // commit; they leave the frame showing the previous page.
 691   if (response && response->head.headers.get() &&
 692       (response->head.headers->response_code() == 204 ||
 693        response->head.headers->response_code() == 205)) {
 694     CancelNavigation(frame_tree_node);
 695     return;
 696   }
 697
 698   // Select an appropriate renderer to commit the navigation.
 699   RenderFrameHostImpl* render_frame_host =
 700       frame_tree_node->render_manager()->GetFrameHostForNavigation(
 701           *navigation_request);
 702
 703   // The renderer can exit view source mode when any error or cancellation
 704   // happen. When reusing the same renderer, overwrite to recover the mode.
 705   if (navigation_request->is_view_source() &&
 706       render_frame_host ==
 707           frame_tree_node->render_manager()->current_frame_host()) {
 708     DCHECK(!render_frame_host->GetParent());
 709     render_frame_host->render_view_host()->Send(
 710         new ViewMsg_EnableViewSourceMode(
 711             render_frame_host->render_view_host()->GetRoutingID()));
 712   }
 713
 714   CheckWebUIRendererDoesNotDisplayNormalURL(
 715       render_frame_host, navigation_request->common_params().url);
 716
 717   render_frame_host->CommitNavigation(response, body.Pass(),
 718                                       navigation_request->common_params(),
 719                                       navigation_request->request_params());
 720
 721 }
 722
 723 // PlzNavigate
 724 void NavigatorImpl::FailedNavigation(FrameTreeNode* frame_tree_node,
 725                                      bool has_stale_copy_in_cache,
 726                                      int error_code) {
 727   CHECK(base::CommandLine::ForCurrentProcess()->HasSwitch(
 728       switches::kEnableBrowserSideNavigation));
 729
 730   NavigationRequest* navigation_request = frame_tree_node->navigation_request();
 731   DCHECK(navigation_request);
 732
 733   // If the request was canceled by the user do not show an error page.
 734   if (error_code == net::ERR_ABORTED) {
 735     frame_tree_node->ResetNavigationRequest(false);
 736     return;
 737   }
 738
 739   // Select an appropriate renderer to show the error page.
 740   RenderFrameHostImpl* render_frame_host =
 741       frame_tree_node->render_manager()->GetFrameHostForNavigation(
 742           *navigation_request);
 743   CheckWebUIRendererDoesNotDisplayNormalURL(
 744       render_frame_host, navigation_request->common_params().url);
 745
 746   render_frame_host->FailedNavigation(navigation_request->common_params(),
 747                                       navigation_request->request_params(),
 748                                       has_stale_copy_in_cache, error_code);
 749 }
 750
 751 // PlzNavigate
 752 void NavigatorImpl::CancelNavigation(FrameTreeNode* frame_tree_node) {
 753   CHECK(base::CommandLine::ForCurrentProcess()->HasSwitch(
 754       switches::kEnableBrowserSideNavigation));
 755   frame_tree_node->ResetNavigationRequest(false);
 756   if (frame_tree_node->IsMainFrame())
 757     navigation_data_.reset();
 758 }
 759
 760 void NavigatorImpl::LogResourceRequestTime(
 761     base::TimeTicks timestamp, const GURL& url) {
 762   if (navigation_data_ && navigation_data_->url_ == url) {
 763     navigation_data_->url_job_start_time_ = timestamp;
 764     UMA_HISTOGRAM_TIMES(
 765         "Navigation.TimeToURLJobStart",
 766         navigation_data_->url_job_start_time_ - navigation_data_->start_time_);
 767   }
 768 }
 769
 770 void NavigatorImpl::LogBeforeUnloadTime(
 771     const base::TimeTicks& renderer_before_unload_start_time,
 772     const base::TimeTicks& renderer_before_unload_end_time) {
 773   // Only stores the beforeunload delay if we're tracking a browser initiated
 774   // navigation and it happened later than the navigation request.
 775   if (navigation_data_ &&
 776       renderer_before_unload_start_time > navigation_data_->start_time_) {
 777     navigation_data_->before_unload_delay_ =
 778         renderer_before_unload_end_time - renderer_before_unload_start_time;
 779   }
 780 }
 781
 782 void NavigatorImpl::CheckWebUIRendererDoesNotDisplayNormalURL(
 783     RenderFrameHostImpl* render_frame_host,
 784     const GURL& url) {
 785   int enabled_bindings =
 786       render_frame_host->render_view_host()->GetEnabledBindings();
 787   bool is_allowed_in_web_ui_renderer =
 788       WebUIControllerFactoryRegistry::GetInstance()->IsURLAcceptableForWebUI(
 789           controller_->GetBrowserContext(), url);
 790   if ((enabled_bindings & BINDINGS_POLICY_WEB_UI) &&
 791       !is_allowed_in_web_ui_renderer) {
 792     // Log the URL to help us diagnose any future failures of this CHECK.
 793     GetContentClient()->SetActiveURL(url);
 794     CHECK(0);
 795   }
 796 }
 797
 798 // PlzNavigate
 799 void NavigatorImpl::RequestNavigation(
 800     FrameTreeNode* frame_tree_node,
 801     const GURL& dest_url,
 802     const Referrer& dest_referrer,
 803     const FrameNavigationEntry& frame_entry,
 804     const NavigationEntryImpl& entry,
 805     NavigationController::ReloadType reload_type,
 806     bool is_same_document_history_load,
 807     base::TimeTicks navigation_start) {
 808   CHECK(base::CommandLine::ForCurrentProcess()->HasSwitch(
 809       switches::kEnableBrowserSideNavigation));
 810   DCHECK(frame_tree_node);
 811
 812   // This value must be set here because creating a NavigationRequest might
 813   // change the renderer live/non-live status and change this result.
 814   bool should_dispatch_beforeunload =
 815       frame_tree_node->current_frame_host()->ShouldDispatchBeforeUnload();
 816   FrameMsg_Navigate_Type::Value navigation_type =
 817       GetNavigationType(controller_->GetBrowserContext(), entry, reload_type);
 818   frame_tree_node->CreatedNavigationRequest(
 819       NavigationRequest::CreateBrowserInitiated(
 820           frame_tree_node, dest_url, dest_referrer, frame_entry, entry,
 821           navigation_type, is_same_document_history_load, navigation_start,
 822           controller_));
 823   NavigationRequest* navigation_request = frame_tree_node->navigation_request();
 824
 825   // Have the current renderer execute its beforeunload event if needed. If it
 826   // is not needed (when beforeunload dispatch is not needed or this navigation
 827   // is synchronous and same-site) then NavigationRequest::BeginNavigation
 828   // should be directly called instead.
 829   if (should_dispatch_beforeunload &&
 830       ShouldMakeNetworkRequestForURL(
 831           navigation_request->common_params().url)) {
 832     navigation_request->SetWaitingForRendererResponse();
 833     frame_tree_node->current_frame_host()->DispatchBeforeUnload(true);
 834   } else {
 835     navigation_request->BeginNavigation();
 836   }
 837 }
 838
 839 void NavigatorImpl::RecordNavigationMetrics(
 840     const LoadCommittedDetails& details,
 841     const FrameHostMsg_DidCommitProvisionalLoad_Params& params,
 842     SiteInstance* site_instance) {
 843   DCHECK(site_instance->HasProcess());
 844
 845   if (!details.is_in_page)
 846     RecordAction(base::UserMetricsAction("FrameLoad"));
 847
 848   if (!details.is_main_frame || !navigation_data_ ||
 849       navigation_data_->url_job_start_time_.is_null() ||
 850       navigation_data_->url_ != params.original_request_url) {
 851     return;
 852   }
 853
 854   base::TimeDelta time_to_commit =
 855       base::TimeTicks::Now() - navigation_data_->start_time_;
 856   UMA_HISTOGRAM_TIMES("Navigation.TimeToCommit", time_to_commit);
 857
 858   time_to_commit -= navigation_data_->before_unload_delay_;
 859   base::TimeDelta time_to_network = navigation_data_->url_job_start_time_ -
 860                                     navigation_data_->start_time_ -
 861                                     navigation_data_->before_unload_delay_;
 862   if (navigation_data_->is_restoring_from_last_session_) {
 863     UMA_HISTOGRAM_TIMES(
 864         "Navigation.TimeToCommit_SessionRestored_BeforeUnloadDiscounted",
 865         time_to_commit);
 866     UMA_HISTOGRAM_TIMES(
 867         "Navigation.TimeToURLJobStart_SessionRestored_BeforeUnloadDiscounted",
 868         time_to_network);
 869     navigation_data_.reset();
 870     return;
 871   }
 872   bool navigation_created_new_renderer_process =
 873       site_instance->GetProcess()->GetInitTimeForNavigationMetrics() >
 874       navigation_data_->start_time_;
 875   if (navigation_created_new_renderer_process) {
 876     UMA_HISTOGRAM_TIMES(
 877         "Navigation.TimeToCommit_NewRenderer_BeforeUnloadDiscounted",
 878         time_to_commit);
 879     UMA_HISTOGRAM_TIMES(
 880         "Navigation.TimeToURLJobStart_NewRenderer_BeforeUnloadDiscounted",
 881         time_to_network);
 882   } else {
 883     UMA_HISTOGRAM_TIMES(
 884         "Navigation.TimeToCommit_ExistingRenderer_BeforeUnloadDiscounted",
 885         time_to_commit);
 886     UMA_HISTOGRAM_TIMES(
 887         "Navigation.TimeToURLJobStart_ExistingRenderer_BeforeUnloadDiscounted",
 888         time_to_network);
 889   }
 890   navigation_data_.reset();
 891 }
 892
 893 void NavigatorImpl::DidStartMainFrameNavigation(
 894     const GURL& url,
 895     SiteInstanceImpl* site_instance) {
 896   // If there is no browser-initiated pending entry for this navigation and it
 897   // is not for the error URL, create a pending entry using the current
 898   // SiteInstance, and ensure the address bar updates accordingly.  We don't
 899   // know the referrer or extra headers at this point, but the referrer will
 900   // be set properly upon commit.
 901   NavigationEntryImpl* pending_entry = controller_->GetPendingEntry();
 902   bool has_browser_initiated_pending_entry =
 903       pending_entry && !pending_entry->is_renderer_initiated();
 904   if (!has_browser_initiated_pending_entry) {
 905     scoped_ptr<NavigationEntryImpl> entry =
 906         NavigationEntryImpl::FromNavigationEntry(
 907             controller_->CreateNavigationEntry(
 908                 url, content::Referrer(), ui::PAGE_TRANSITION_LINK,
 909                 true /* is_renderer_initiated */, std::string(),
 910                 controller_->GetBrowserContext()));
 911     entry->set_site_instance(site_instance);
 912     // TODO(creis): If there's a pending entry already, find a safe way to
 913     // update it instead of replacing it and copying over things like this.
 914     if (pending_entry) {
 915       entry->set_transferred_global_request_id(
 916           pending_entry->transferred_global_request_id());
 917       entry->set_should_replace_entry(pending_entry->should_replace_entry());
 918       entry->SetRedirectChain(pending_entry->GetRedirectChain());
 919     }
 920     controller_->SetPendingEntry(entry.Pass());
 921     if (delegate_)
 922       delegate_->NotifyChangedNavigationState(content::INVALIDATE_TYPE_URL);
 923   }
 924 }
 925
 926 }  // namespace content