Move WebUI ownership from the RenderFrameHostManager to the RenderFrameHost.

content/browser/frame_host/render_frame_host_manager.cc

 // Copyright 2013 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/frame_host/render_frame_host_manager.h"
 
 #include <algorithm>
 #include <utility>
 
 #include "base/command_line.h"
@@ skipping 12 matching lines @@
 #include "content/browser/frame_host/navigation_request.h"
 #include "content/browser/frame_host/navigator.h"
 #include "content/browser/frame_host/render_frame_host_factory.h"
 #include "content/browser/frame_host/render_frame_host_impl.h"
 #include "content/browser/frame_host/render_frame_proxy_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/webui/web_ui_controller_factory_registry.h"
-#include "content/browser/webui/web_ui_impl.h"
 #include "content/common/frame_messages.h"
 #include "content/common/site_isolation_policy.h"
 #include "content/common/view_messages.h"
 #include "content/public/browser/content_browser_client.h"
 #include "content/public/browser/render_process_host_observer.h"
 #include "content/public/browser/render_widget_host_iterator.h"
 #include "content/public/browser/render_widget_host_view.h"
 #include "content/public/browser/user_metrics.h"
-#include "content/public/browser/web_ui_controller.h"
 #include "content/public/common/browser_plugin_guest_mode.h"
 #include "content/public/common/content_switches.h"
 #include "content/public/common/referrer.h"
 #include "content/public/common/url_constants.h"
 
 namespace content {
 
 namespace {
 
 // Helper function to add the FrameTree of the given node's opener to the list
@@ skipping 160 matching lines @@
     RenderViewHostDelegate* render_view_delegate,
     RenderWidgetHostDelegate* render_widget_delegate,
     Delegate* delegate)
     : frame_tree_node_(frame_tree_node),
       delegate_(delegate),
       render_frame_delegate_(render_frame_delegate),
       render_view_delegate_(render_view_delegate),
       render_widget_delegate_(render_widget_delegate),
       proxy_hosts_(new RenderFrameProxyHostMap(this)),
       interstitial_page_(nullptr),
-      should_reuse_web_ui_(false),
       weak_factory_(this) {
   DCHECK(frame_tree_node_);
 }
 
 RenderFrameHostManager::~RenderFrameHostManager() {
   if (pending_render_frame_host_) {
     scoped_ptr<RenderFrameHostImpl> relic = UnsetPendingRenderFrameHost();
     ShutdownProxiesIfLastActiveFrameInSiteInstance(relic.get());
   }
 
   if (speculative_render_frame_host_) {
     scoped_ptr<RenderFrameHostImpl> relic = UnsetSpeculativeRenderFrameHost();
     ShutdownProxiesIfLastActiveFrameInSiteInstance(relic.get());
   }
 
   ShutdownProxiesIfLastActiveFrameInSiteInstance(render_frame_host_.get());
 
   // Delete any RenderFrameProxyHosts and swapped out RenderFrameHosts.
   // It is important to delete those prior to deleting the current
   // RenderFrameHost, since the CrossProcessFrameConnector (owned by
   // RenderFrameProxyHost) points to the RenderWidgetHostView associated with
   // the current RenderFrameHost and uses it during its destructor.
   ResetProxyHosts();
 
-  // Release the WebUI prior to resetting the current RenderFrameHost, as the
-  // WebUI accesses the RenderFrameHost during cleanup.
-  web_ui_.reset();
-
   // We should always have a current RenderFrameHost except in some tests.
   SetRenderFrameHost(scoped_ptr<RenderFrameHostImpl>());
 }
 
 void RenderFrameHostManager::Init(BrowserContext* browser_context,
                                   SiteInstance* site_instance,
                                   int32 view_routing_id,
                                   int32 frame_routing_id,
                                   int32 widget_routing_id) {
   // Create a RenderViewHost and RenderFrameHost, once we have an instance.  It
@@ skipping 82 matching lines @@
 
 void RenderFrameHostManager::RemoveOuterDelegateFrame() {
   FrameTreeNode* outer_delegate_frame_tree_node =
       FrameTreeNode::GloballyFindByID(
           delegate_->GetOuterDelegateFrameTreeNodeID());
   DCHECK(outer_delegate_frame_tree_node->parent());
   outer_delegate_frame_tree_node->frame_tree()->RemoveFrame(
       outer_delegate_frame_tree_node);
 }
 
-void RenderFrameHostManager::SetPendingWebUI(const GURL& url, int bindings) {
-  pending_web_ui_ = CreateWebUI(url, bindings);
-  pending_and_current_web_ui_.reset();
-}
-
-scoped_ptr<WebUIImpl> RenderFrameHostManager::CreateWebUI(const GURL& url,
-                                                          int bindings) {
-  scoped_ptr<WebUIImpl> new_web_ui(delegate_->CreateWebUIForRenderManager(url));
-
-  // 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 (new_web_ui && bindings != NavigationEntryImpl::kInvalidBindings &&
-      new_web_ui->GetBindings() != bindings) {
-    RecordAction(base::UserMetricsAction("ProcessSwapBindingsMismatch_RVHM"));
-    return nullptr;
-  }
-  return new_web_ui.Pass();
-}
-
 RenderFrameHostImpl* RenderFrameHostManager::Navigate(
     const GURL& dest_url,
     const FrameNavigationEntry& frame_entry,
     const NavigationEntryImpl& entry) {
   TRACE_EVENT1("navigation", "RenderFrameHostManager:Navigate",
                "FrameTreeNode id", frame_tree_node_->frame_tree_node_id());
   // Create a pending RenderFrameHost to use for the navigation.
   RenderFrameHostImpl* dest_render_frame_host = UpdateStateForNavigate(
       dest_url,
       // TODO(creis): Move source_site_instance to FNE.
@@ skipping 26 matching lines @@
     // RenderView can cause browser-side code to execute that expects the this
     // RFH's ServiceRegistry to be initialized (e.g., if the site is a WebUI
     // site that is handled via Mojo, then Mojo WebUI code in //chrome will
     // add a service to this RFH's ServiceRegistry).
     dest_render_frame_host->SetUpMojoIfNeeded();
 
     // Recreate the opener chain.
     CreateOpenerProxies(dest_render_frame_host->GetSiteInstance(),
                         frame_tree_node_);
     if (!InitRenderView(dest_render_frame_host->render_view_host(),
-                        MSG_ROUTING_NONE))
+                        MSG_ROUTING_NONE, pending_web_ui()))
       return nullptr;
 
     // 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_frame_host != render_frame_host_) {
       if (dest_render_frame_host->GetView())
         dest_render_frame_host->GetView()->Hide();
     } else {
       // After a renderer crash we'd have marked the host as invisible, so we
@@ skipping 231 matching lines @@
 
   // Make sure any dynamic changes to this frame's sandbox flags that were made
   // prior to navigation take effect.
   CommitPendingSandboxFlags();
 }
 
 void RenderFrameHostManager::CommitPendingIfNecessary(
     RenderFrameHostImpl* render_frame_host,
     bool was_caused_by_user_gesture) {
   if (!pending_render_frame_host_ && !speculative_render_frame_host_) {
-    DCHECK_IMPLIES(should_reuse_web_ui_, web_ui_);
 
     // We should only hear this from our current renderer.
     DCHECK_EQ(render_frame_host_, render_frame_host);
 
-    // Even when there is no pending RVH, there may be a pending Web UI.
-    if (pending_web_ui() || speculative_web_ui_)
+    // If current RenderFrameHost has a pending Web UI, commit it.
+    if (render_frame_host_->pending_web_ui())
       CommitPending();
     return;
   }
 
   if (render_frame_host == pending_render_frame_host_ ||
       render_frame_host == speculative_render_frame_host_) {
     // The pending cross-process navigation completed, so show the renderer.
     CommitPending();
   } else if (render_frame_host == render_frame_host_) {
     if (base::CommandLine::ForCurrentProcess()->HasSwitch(
@@ skipping 312 matching lines @@
   if (current_site_instance == dest_site_instance.get() ||
       (!request.browser_initiated() && is_main_frame) ||
       (!is_main_frame && !dest_site_instance->RequiresDedicatedProcess() &&
        !current_site_instance->RequiresDedicatedProcess())) {
     // Reuse the current RFH if its SiteInstance matches the the navigation's
     // or if this is a subframe navigation. We only swap RFHs for subframes when
     // --site-per-process is enabled.
     CleanUpNavigation();
     navigation_rfh = render_frame_host_.get();
 
-    // As SiteInstances are the same, check if the WebUI should be reused.
-    const NavigationEntry* current_navigation_entry =
-        delegate_->GetLastCommittedNavigationEntryForRenderManager();
-    should_reuse_web_ui_ = ShouldReuseWebUI(current_navigation_entry,
-                                            request.common_params().url);
-    if (!should_reuse_web_ui_) {
-      speculative_web_ui_ = CreateWebUI(request.common_params().url,
-                                        request.bindings());
-      // Make sure the current RenderViewHost has the right bindings.
-      if (speculative_web_ui() &&
-          !render_frame_host_->GetProcess()->IsForGuestsOnly()) {
-        render_frame_host_->render_view_host()->AllowBindings(
-            speculative_web_ui()->GetBindings());
-      }
-    }
+    // As SiteInstances are the same, make the RFH update its possible pending
+    // WebUI.
+    render_frame_host_->UpdatePendingWebUI(request.common_params().url,
+                                           request.bindings());
+    DCHECK(!speculative_render_frame_host_);
+    DCHECK(speculative_web_ui() == render_frame_host_->pending_web_ui());
   } else {
     // If the SiteInstance for the final URL doesn't match the one from the
     // speculatively created RenderFrameHost, create a new RenderFrameHost using
     // this new SiteInstance.
     if (!speculative_render_frame_host_ ||
         speculative_render_frame_host_->GetSiteInstance() !=
             dest_site_instance.get()) {
       CleanUpNavigation();
       bool success = CreateSpeculativeRenderFrameHost(
           request.common_params().url, current_site_instance,
           dest_site_instance.get(), request.bindings());
       DCHECK(success);
+    } else {
+      // When reusing an existing speculative RenderFrameHost its active WebUI
+      // must be updated to make sure it matches the current URL. As it is not a
+      // new RenderFrameHost instance it must be done by updating the pending
+      // WebUI and immediately making it active.
+      speculative_render_frame_host_->UpdatePendingWebUI(
+          request.common_params().url, request.bindings());
+      speculative_render_frame_host_->CommitPendingWebUI();

[clamy, 2015/10/01 13:15:13]

Is the CommitPendingWebUI method idempotent? (that would be nice, it would make
the commit logic easier)

[carlosk, 2015/10/01 16:00:22]

I don't understand your point here. It's a commit operation so there is a change
in internal state when a call happens. If a new call is made immediately after
the state changes again.

What is the behavior you are suggesting?

[clamy, 2015/10/02 14:20:01]

I was thinking of something along the lines of having CommitPendingWebUI be a
CommitPendingWebUIIfNecesssary function. Inside RFH, instead of having
should_reuse_web_ui, you'd have a has_pending_web_ui boolean (note that the
pending WebUI can be nullptr). If !has_pending_web_ui, then
CommitPendingWebUIIfNecesssary is a no-op, otherwise you replace the web_ui by
whatever pending_web_ui including nullptr (and has_pending_web_ui becomes false
again).

This way, we can call CommitPendingWebUIIfNecesssary as many times as we want,
without having to check if we have a pending_web_ui. I'm thinking this may make
the code slightly simpler. Wdyt?

     }
     DCHECK(speculative_render_frame_host_);
+    DCHECK_EQ(speculative_web_ui(), speculative_render_frame_host_->web_ui());
+
     navigation_rfh = speculative_render_frame_host_.get();
 
     // Check if our current RFH is live.
     if (!render_frame_host_->IsRenderFrameLive()) {
       // The current RFH is not live.  There's no reason to sit around with a
       // sad tab or a newly created RFH while we wait for the navigation to
       // complete. Just switch to the speculative RFH now and go back to normal.
       // (Note that we don't care about on{before}unload handlers if the current
       // RFH isn't live.)
       CommitPending();
     }
   }
   DCHECK(navigation_rfh &&
          (navigation_rfh == render_frame_host_.get() ||
           navigation_rfh == speculative_render_frame_host_.get()));
 
   // If the RenderFrame that needs to navigate is not live (its process was just
   // created or has crashed), initialize it.
   if (!navigation_rfh->IsRenderFrameLive()) {
     // Recreate the opener chain.
     CreateOpenerProxies(navigation_rfh->GetSiteInstance(), frame_tree_node_);
-    if (!InitRenderView(navigation_rfh->render_view_host(), MSG_ROUTING_NONE)) {
+    if (!InitRenderView(navigation_rfh->render_view_host(), MSG_ROUTING_NONE,
+                        speculative_web_ui())) {
       return nullptr;
     }
 
     if (navigation_rfh == render_frame_host_) {
       // TODO(nasko): This is a very ugly hack. The Chrome extensions process
       // manager still uses NotificationService and expects to see a
       // RenderViewHost changed notification after WebContents and
       // RenderFrameHostManager are completely initialized. This should be
       // removed once the process manager moves away from NotificationService.
       // See https://crbug.com/462682.
       delegate_->NotifyMainFrameSwappedFromRenderManager(
           nullptr, render_frame_host_->render_view_host());
     }
   }
 
   return navigation_rfh;
 }
 
 // PlzNavigate
 void RenderFrameHostManager::CleanUpNavigation() {
   CHECK(base::CommandLine::ForCurrentProcess()->HasSwitch(
       switches::kEnableBrowserSideNavigation));
-  speculative_web_ui_.reset();
-  should_reuse_web_ui_ = false;
+  render_frame_host_->DiscardPendingWebUI();
   if (speculative_render_frame_host_)
     DiscardUnusedFrame(UnsetSpeculativeRenderFrameHost());
 }
 
 // PlzNavigate
 scoped_ptr<RenderFrameHostImpl>
 RenderFrameHostManager::UnsetSpeculativeRenderFrameHost() {
   CHECK(base::CommandLine::ForCurrentProcess()->HasSwitch(
       switches::kEnableBrowserSideNavigation));
   speculative_render_frame_host_->GetProcess()->RemovePendingView();
@@ skipping 163 matching lines @@
   // 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/", Blink doesn't treat
   // it as a new navigation). So require a BrowsingInstance switch.
   if (current_is_view_source_mode != new_is_view_source_mode)
     return true;
 
   return false;
 }
 
-bool RenderFrameHostManager::ShouldReuseWebUI(
-    const NavigationEntry* current_entry,
-    const GURL& new_url) const {
-  NavigationControllerImpl& controller =
-      delegate_->GetControllerForRenderManager();
-  return current_entry && web_ui_ &&
-      (WebUIControllerFactoryRegistry::GetInstance()->GetWebUIType(
-          controller.GetBrowserContext(), current_entry->GetURL()) ==
-       WebUIControllerFactoryRegistry::GetInstance()->GetWebUIType(
-          controller.GetBrowserContext(), new_url));
-}
-
 SiteInstance* RenderFrameHostManager::GetSiteInstanceForNavigation(
     const GURL& dest_url,
     SiteInstance* source_instance,
     SiteInstance* dest_instance,
     SiteInstance* candidate_instance,
     ui::PageTransition transition,
     bool dest_is_restore,
     bool dest_is_view_source_mode) {
   SiteInstance* current_instance = render_frame_host_->GetSiteInstance();
 
@@ skipping 263 matching lines @@
   // 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.)
   if (current_entry)
     return current_entry->GetURL();
   return current_instance->GetSiteURL();
 }
 
 void RenderFrameHostManager::CreatePendingRenderFrameHost(
     SiteInstance* old_instance,
-    SiteInstance* new_instance) {
+    SiteInstance* new_instance,
+    const GURL& url,
+    int bindings) {
   int create_render_frame_flags = 0;
   if (delegate_->IsHidden())
     create_render_frame_flags |= CREATE_RF_HIDDEN;
 
   if (pending_render_frame_host_)
     CancelPending();
 
   // The process for the new SiteInstance may (if we're sharing a process with
   // another host that already initialized it) or may not (we have our own
   // process or the existing process crashed) have been initialized. Calling
   // Init multiple times will be ignored, so this is safe.
   if (!new_instance->GetProcess()->Init())
     return;
 
   CreateProxiesForNewRenderFrameHost(old_instance, new_instance);
 
   // Create a non-swapped-out RFH with the given opener.
-  pending_render_frame_host_ = CreateRenderFrame(
-      new_instance, pending_web_ui(), create_render_frame_flags, nullptr);
+  pending_render_frame_host_ = CreateRenderFrameInternal(
+      new_instance, url, bindings, create_render_frame_flags, nullptr);
 }
 
 void RenderFrameHostManager::CreateProxiesForNewRenderFrameHost(
     SiteInstance* old_instance,
     SiteInstance* new_instance) {
   // Only create opener proxies if they are in the same BrowsingInstance.
   if (new_instance->IsRelatedSiteInstance(old_instance)) {
     CreateOpenerProxies(new_instance, frame_tree_node_);
   } else if (SiteIsolationPolicy::AreCrossProcessFramesPossible()) {
     // Ensure that the frame tree has RenderFrameProxyHosts for the
@@ skipping 67 matching lines @@
 }
 
 // PlzNavigate
 bool RenderFrameHostManager::CreateSpeculativeRenderFrameHost(
     const GURL& url,
     SiteInstance* old_instance,
     SiteInstance* new_instance,
     int bindings) {
   CHECK(new_instance);
   CHECK_NE(old_instance, new_instance);
-  CHECK(!should_reuse_web_ui_);
-
-  // Note: |speculative_web_ui_| must be initialized before starting the
-  // |speculative_render_frame_host_| creation steps otherwise the WebUI
-  // won't be properly initialized.
-  speculative_web_ui_ = CreateWebUI(url, bindings);
 
   // The process for the new SiteInstance may (if we're sharing a process with
   // another host that already initialized it) or may not (we have our own
   // process or the existing process crashed) have been initialized. Calling
   // Init multiple times will be ignored, so this is safe.
   if (!new_instance->GetProcess()->Init())
     return false;
 
   CreateProxiesForNewRenderFrameHost(old_instance, new_instance);
 
   int create_render_frame_flags = 0;
   if (delegate_->IsHidden())
     create_render_frame_flags |= CREATE_RF_HIDDEN;
-  speculative_render_frame_host_ =
-      CreateRenderFrame(new_instance, speculative_web_ui_.get(),
-                        create_render_frame_flags, nullptr);
+  speculative_render_frame_host_ = CreateRenderFrameInternal(
+      new_instance, url, bindings, create_render_frame_flags, nullptr);
 
-  if (!speculative_render_frame_host_) {
-    speculative_web_ui_.reset();
-    return false;
-  }
   return true;
 }
 
 scoped_ptr<RenderFrameHostImpl> RenderFrameHostManager::CreateRenderFrame(
     SiteInstance* instance,
-    WebUIImpl* web_ui,
     int flags,
     int* view_routing_id_ptr) {
+  return CreateRenderFrameInternal(instance, GURL(),
+                                   NavigationEntryImpl::kInvalidBindings, flags,
+                                   view_routing_id_ptr);
+}
+
+scoped_ptr<RenderFrameHostImpl>
+RenderFrameHostManager::CreateRenderFrameInternal(SiteInstance* instance,

[carlosk, 2015/09/30 19:37:27]

I chose to leave the implementation of CreateRenderFrameInternal here to be
diff-friendly. Should it be moved to the correct place (header-order-wise) in a
following CL?

[clamy, 2015/10/01 13:15:13]

Acknowledged.

+                                                  const GURL& url,
+                                                  int bindings,
+                                                  int flags,
+                                                  int* view_routing_id_ptr) {
   bool swapped_out = !!(flags & CREATE_RF_SWAPPED_OUT);
   bool swapped_out_forbidden =
       SiteIsolationPolicy::IsSwappedOutStateForbidden();
 
   CHECK(instance);
   CHECK_IMPLIES(swapped_out_forbidden, !swapped_out);
   CHECK_IMPLIES(!SiteIsolationPolicy::AreCrossProcessFramesPossible(),
                 frame_tree_node_->IsMainFrame());
 
   // Swapped out views should always be hidden.
@@ skipping 14 matching lines @@
   RenderFrameProxyHost* proxy = GetRenderFrameProxyHost(instance);
   if (proxy && proxy->render_frame_host()) {
     RenderViewHost* render_view_host = proxy->GetRenderViewHost();
     CHECK(!swapped_out_forbidden);
     if (view_routing_id_ptr)
       *view_routing_id_ptr = proxy->GetRenderViewHost()->GetRoutingID();
     // Delete the existing RenderFrameProxyHost, but reuse the RenderFrameHost.
     // Prevent the process from exiting while we're trying to use it.
     if (!swapped_out) {
       new_render_frame_host = proxy->PassFrameHostOwnership();
+      new_render_frame_host->InitializeWebUI(url, bindings);
       new_render_frame_host->GetProcess()->AddPendingView();
 
       proxy_hosts_->Remove(instance->GetId());
       // NB |proxy| is deleted at this point.
 
       // If we are reusing the RenderViewHost and it doesn't already have a
       // RenderWidgetHostView, we need to create one if this is the main frame.
       if (!render_view_host->GetView() && frame_tree_node_->IsMainFrame())
         delegate_->CreateRenderWidgetHostViewForRenderManager(render_view_host);
     }
   } else {
     // Create a new RenderFrameHost if we don't find an existing one.
 
     int32 widget_routing_id = MSG_ROUTING_NONE;
     // A RenderFrame in a different process from its parent RenderFrame
     // requires a RenderWidget for input/layout/painting.
     if (frame_tree_node_->parent() &&
         frame_tree_node_->parent()->current_frame_host()->GetSiteInstance() !=
             instance) {
       CHECK(SiteIsolationPolicy::AreCrossProcessFramesPossible());
       widget_routing_id = instance->GetProcess()->GetNextRoutingID();
     }
 
     new_render_frame_host = CreateRenderFrameHost(
         instance, MSG_ROUTING_NONE, MSG_ROUTING_NONE, widget_routing_id, flags);
+    new_render_frame_host->InitializeWebUI(url, bindings);
     RenderViewHostImpl* render_view_host =
         new_render_frame_host->render_view_host();
     int proxy_routing_id = MSG_ROUTING_NONE;
 
     // Prevent the process from exiting while we're trying to navigate in it.
     // Otherwise, if the new RFH is swapped out already, store it.
     if (!swapped_out) {
       new_render_frame_host->GetProcess()->AddPendingView();
     } else {
       proxy = new RenderFrameProxyHost(
           new_render_frame_host->GetSiteInstance(),
           new_render_frame_host->render_view_host(), frame_tree_node_);
       proxy_hosts_->Add(instance->GetId(), make_scoped_ptr(proxy));
       proxy_routing_id = proxy->GetRoutingID();
       proxy->TakeFrameHostOwnership(new_render_frame_host.Pass());
     }
 
     if (frame_tree_node_->IsMainFrame()) {
-      success = InitRenderView(render_view_host, proxy_routing_id);
+      success = InitRenderView(
+          render_view_host, proxy_routing_id,
+          swapped_out ? nullptr : new_render_frame_host->web_ui());
 
       // If we are reusing the RenderViewHost and it doesn't already have a
       // RenderWidgetHostView, we need to create one if this is the main frame.
       if (!swapped_out && !render_view_host->GetView())
         delegate_->CreateRenderWidgetHostViewForRenderManager(render_view_host);
     } else {
       DCHECK(render_view_host->IsRenderViewLive());
     }
 
     if (success) {
@@ skipping 18 matching lines @@
         success = InitRenderFrame(new_render_frame_host.get());
       }
     }
 
     if (success) {
       if (view_routing_id_ptr)
         *view_routing_id_ptr = render_view_host->GetRoutingID();
     }
   }
 
-  // When a new RenderView is created by the renderer process, the new
-  // WebContents gets a RenderViewHost in the SiteInstance of its opener
-  // WebContents. If not used in the first navigation, this RVH is swapped out
-  // and is not granted bindings, so we may need to grant them when swapping it
-  // in.
-  if (web_ui && !new_render_frame_host->GetProcess()->IsForGuestsOnly()) {
-    int required_bindings = web_ui->GetBindings();
-    RenderViewHost* render_view_host =
-        new_render_frame_host->render_view_host();
-    if ((render_view_host->GetEnabledBindings() & required_bindings) !=
-            required_bindings) {
-      render_view_host->AllowBindings(required_bindings);
-    }
-  }
-
   // Returns the new RFH if it isn't swapped out.
   if (success && !swapped_out) {
     DCHECK(new_render_frame_host->GetSiteInstance() == instance);
     return new_render_frame_host.Pass();
   }
   return nullptr;
 }
 
 int RenderFrameHostManager::CreateRenderFrameProxy(SiteInstance* instance) {
   // A RenderFrameProxyHost should never be created in the same SiteInstance as
@@ skipping 20 matching lines @@
     return proxy->GetRoutingID();
 
   if (!proxy) {
     proxy =
         new RenderFrameProxyHost(instance, render_view_host, frame_tree_node_);
     proxy_hosts_->Add(instance->GetId(), make_scoped_ptr(proxy));
   }
 
   if (SiteIsolationPolicy::IsSwappedOutStateForbidden() &&
       frame_tree_node_->IsMainFrame()) {
-    InitRenderView(render_view_host, proxy->GetRoutingID());
+    InitRenderView(render_view_host, proxy->GetRoutingID(), nullptr);
     proxy->set_render_frame_proxy_created(true);
   } else {
     proxy->InitRenderFrameProxy();
   }
 
   return proxy->GetRoutingID();
 }
 
 void RenderFrameHostManager::CreateProxiesForChildFrame(FrameTreeNode* child) {
   for (const auto& pair : *proxy_hosts_) {
@@ skipping 14 matching lines @@
 
   if (render_view_host->IsRenderViewLive())
     return;
 
   // If the proxy in |instance| doesn't exist, this RenderView is not swapped
   // out and shouldn't be reinitialized here.
   RenderFrameProxyHost* proxy = GetRenderFrameProxyHost(instance);
   if (!proxy)
     return;
 
-  InitRenderView(render_view_host, proxy->GetRoutingID());
+  InitRenderView(render_view_host, proxy->GetRoutingID(), nullptr);
   proxy->set_render_frame_proxy_created(true);
 }
 
 void RenderFrameHostManager::CreateOuterDelegateProxy(
     SiteInstance* outer_contents_site_instance,
     RenderFrameHostImpl* render_frame_host) {
   CHECK(BrowserPluginGuestMode::UseCrossProcessFramesForGuests());
   RenderFrameProxyHost* proxy = new RenderFrameProxyHost(
       outer_contents_site_instance, nullptr, frame_tree_node_);
   proxy_hosts_->Add(outer_contents_site_instance->GetId(),
@@ skipping 14 matching lines @@
 }
 
 void RenderFrameHostManager::SetRWHViewForInnerContents(
     RenderWidgetHostView* child_rwhv) {
   DCHECK(ForInnerDelegate() && frame_tree_node_->IsMainFrame());
   GetProxyToOuterDelegate()->SetChildRWHView(child_rwhv);
 }
 
 bool RenderFrameHostManager::InitRenderView(
     RenderViewHostImpl* render_view_host,
-    int proxy_routing_id) {
+    int proxy_routing_id,
+    WebUIImpl* dest_web_ui) {
   // Ensure the renderer process is initialized before creating the
   // RenderView.
   if (!render_view_host->GetProcess()->Init())
     return false;
 
   // We may have initialized this RenderViewHost for another RenderFrameHost.
   if (render_view_host->IsRenderViewLive())
     return true;
 
-  // If the ongoing navigation is to a WebUI and the RenderView is not in a
-  // guest process, tell the RenderViewHost about any bindings it will need
-  // enabled.
-  WebUIImpl* dest_web_ui = nullptr;
-  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
-          switches::kEnableBrowserSideNavigation)) {
-    dest_web_ui =
-        should_reuse_web_ui_ ? web_ui_.get() : speculative_web_ui_.get();
-  } else {
-    dest_web_ui = pending_web_ui();
-  }
-  if (dest_web_ui && !render_view_host->GetProcess()->IsForGuestsOnly()) {
-    render_view_host->AllowBindings(dest_web_ui->GetBindings());
-  } else {
-    // Ensure that we don't create an unprivileged RenderView in a WebUI-enabled
-    // process unless it's swapped out.
-    if (render_view_host->is_active()) {
-      CHECK(!ChildProcessSecurityPolicyImpl::GetInstance()->HasWebUIBindings(
-                render_view_host->GetProcess()->GetID()));
-    }
+  // If the ongoing navigation is not to a WebUI or the RenderView is in a
+  // guest process, ensure that we don't create an unprivileged RenderView in a
+  // WebUI-enabled process unless it's swapped out.
+  if ((!dest_web_ui || render_view_host->GetProcess()->IsForGuestsOnly()) &&
+      render_view_host->is_active()) {
+    CHECK(!ChildProcessSecurityPolicyImpl::GetInstance()->HasWebUIBindings(
+        render_view_host->GetProcess()->GetID()));

[carlosk, 2015/09/30 19:37:27]

In the previous patch set I tried to centralize this logic along with the part
that gives proper bindings to WebUI processes (that used to exist here and in 2
other places in this file). Moving the latter  worked correctly but not this one
above. It failed in a single test:
RenderFrameHostManagerTest.ForceSwapAfterWebUIBindings. It would trigger this
CHECK because when using process-per-tab a renderer process with WebUI bindings
is allowed to navigate to an about://blank page. Is this really WAI?

2nd question: the code that i successfully calls
GetProcess()->IsForGuestsOnly(). Here it calls that starting from the RVH but in
the other 2 cases it calls it on the RFH. In my unified version I used the RFH
as it seemed the OOPIF-correct way (even though the consequent allowing of
bindings always happens on the RVH). Is that important at all and does it make
sense?

[carlosk, 2015/10/06 17:03:21]

Bump on this:
- The first part I already know the answer for: about://blank and a few others
is allowed to use a render process with WebUI bindings. See
WebUIControllerFactoryRegistry::IsURLAcceptableForWebUI.
- The 2nd part is still a doubt I have even though things are working just fine
(so it might not matter).

   }
 
   int opener_frame_routing_id =
       GetOpenerRoutingID(render_view_host->GetSiteInstance());
 
   return delegate_->CreateRenderViewForRenderManager(
       render_view_host, opener_frame_routing_id, proxy_routing_id,
       frame_tree_node_->current_replication_state());
 }
 
@@ skipping 67 matching lines @@
   RenderFrameProxyHost* proxy = GetRenderFrameProxyHost(site_instance);
   if (proxy)
     return proxy->GetRoutingID();
 
   return MSG_ROUTING_NONE;
 }
 
 void RenderFrameHostManager::CommitPending() {
   TRACE_EVENT1("navigation", "RenderFrameHostManager::CommitPending",
                "FrameTreeNode id", frame_tree_node_->frame_tree_node_id());
-  bool browser_side_navigation =
-      base::CommandLine::ForCurrentProcess()->HasSwitch(
-          switches::kEnableBrowserSideNavigation);
-
   // 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
+  // committed yet, so if we've already cleared the pending WebUI 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_ && pending_and_current_web_ui_));
-  if (pending_web_ui_ || speculative_web_ui_) {
-    DCHECK(!should_reuse_web_ui_);
-    web_ui_.reset(browser_side_navigation ? speculative_web_ui_.release()
-                                          : pending_web_ui_.release());
-  } else if (pending_and_current_web_ui_ || should_reuse_web_ui_) {
-    if (browser_side_navigation) {
-      DCHECK(web_ui_);
-      should_reuse_web_ui_ = false;
-    } else {
-      DCHECK_EQ(pending_and_current_web_ui_.get(), web_ui_.get());
-      pending_and_current_web_ui_.reset();
-    }
-  } else {
-    web_ui_.reset();
-  }
-  DCHECK(!speculative_web_ui_);
-  DCHECK(!should_reuse_web_ui_);
-
-  // It's possible for the pending_render_frame_host_ to be nullptr 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_frame_host_ && !speculative_render_frame_host_) {
+  // If the current RenderFrameHost has a pending Web UI then just commit it and
+  // return (there should be nothing else to commit).
+  if (render_frame_host_->pending_web_ui()) {
+    DCHECK(!pending_render_frame_host_ && !speculative_render_frame_host_);
+    render_frame_host_->CommitPendingWebUI();
     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_frame_host_->GetView() &&
                            render_frame_host_->GetView()->HasFocus();
 
   bool is_main_frame = frame_tree_node_->IsMainFrame();
 
   // Swap in the pending or speculative frame and make it active. Also ensure
   // the FrameTree stays in sync.
   scoped_ptr<RenderFrameHostImpl> old_render_frame_host;
-  if (!browser_side_navigation) {
+  if (!base::CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kEnableBrowserSideNavigation)) {
     DCHECK(!speculative_render_frame_host_);
     old_render_frame_host =
         SetRenderFrameHost(pending_render_frame_host_.Pass());
   } else {
     // PlzNavigate
     DCHECK(speculative_render_frame_host_);
     old_render_frame_host =
         SetRenderFrameHost(speculative_render_frame_host_.Pass());
   }
 
@@ skipping 141 matching lines @@
   // If we are currently navigating cross-process, we want to get back to normal
   // and then navigate as usual.
   if (pending_render_frame_host_)
     CancelPending();
 
   SiteInstance* current_instance = render_frame_host_->GetSiteInstance();
   scoped_refptr<SiteInstance> new_instance = GetSiteInstanceForNavigation(
       dest_url, source_instance, dest_instance, nullptr, transition,
       dest_is_restore, dest_is_view_source_mode);
 
-  const NavigationEntry* current_entry =
-      delegate_->GetLastCommittedNavigationEntryForRenderManager();
-
   DCHECK(!pending_render_frame_host_);
 
   if (new_instance.get() != current_instance) {
     TRACE_EVENT_INSTANT2(
         "navigation",
         "RenderFrameHostManager::UpdateStateForNavigate:New SiteInstance",
         TRACE_EVENT_SCOPE_THREAD,
         "current_instance id", current_instance->GetId(),
         "new_instance id", new_instance->GetId());
 
     // New SiteInstance: create a pending RFH to navigate.
 
-    // This will possibly create (set to nullptr) 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(dest_url, bindings);
-    CreatePendingRenderFrameHost(current_instance, new_instance.get());
+    CreatePendingRenderFrameHost(current_instance, new_instance.get(), dest_url,
+                                 bindings);
     if (!pending_render_frame_host_)
       return nullptr;
 
     // Check if our current RFH is live before we set up a transition.
     if (!render_frame_host_->IsRenderFrameLive()) {
       // The current RFH is not live.  There's no reason to sit around with a
       // sad tab or a newly created RFH while we wait for the pending RFH to
       // navigate.  Just switch to the pending RFH now and go back to normal.
       // (Note that we don't care about on{before}unload handlers if the current
       // RFH isn't live.)
@@ skipping 39 matching lines @@
 
   // Otherwise the same SiteInstance can be used.  Navigate render_frame_host_.
 
   // It's possible to swap out the current RFH and then decide to navigate in it
   // anyway (e.g., a cross-process navigation that redirects back to the
   // original site).  In that case, we have a proxy for the current RFH but
   // haven't deleted it yet.  The new navigation will swap it back in, so we can
   // delete the proxy.
   proxy_hosts_->Remove(new_instance.get()->GetId());
 
-  if (ShouldReuseWebUI(current_entry, dest_url)) {
-    pending_web_ui_.reset();
-    pending_and_current_web_ui_ = web_ui_->AsWeakPtr();
-  } else {
-    SetPendingWebUI(dest_url, bindings);
-    // Make sure the new RenderViewHost has the right bindings.
-    if (pending_web_ui() &&
-        !render_frame_host_->GetProcess()->IsForGuestsOnly()) {
-      render_frame_host_->render_view_host()->AllowBindings(
-          pending_web_ui()->GetBindings());
-    }
-  }
-
-  if (pending_web_ui() && render_frame_host_->IsRenderFrameLive()) {
-    pending_web_ui()->RenderViewReused(render_frame_host_->render_view_host(),
-                                       frame_tree_node_->IsMainFrame());
-  }
+  render_frame_host_->UpdatePendingWebUI(dest_url, bindings);
 
   // The renderer can exit view source mode when any error or cancellation
   // happen. We must overwrite to recover the mode.
   if (dest_is_view_source_mode) {
     render_frame_host_->render_view_host()->Send(
         new ViewMsg_EnableViewSourceMode(
             render_frame_host_->render_view_host()->GetRoutingID()));
   }
 
   return render_frame_host_.get();
 }
 
 void RenderFrameHostManager::CancelPending() {
   TRACE_EVENT1("navigation", "RenderFrameHostManager::CancelPending",
                "FrameTreeNode id", frame_tree_node_->frame_tree_node_id());
   DiscardUnusedFrame(UnsetPendingRenderFrameHost());
+  render_frame_host_->DiscardPendingWebUI();
 }
 
 scoped_ptr<RenderFrameHostImpl>
 RenderFrameHostManager::UnsetPendingRenderFrameHost() {
   scoped_ptr<RenderFrameHostImpl> pending_render_frame_host =
       pending_render_frame_host_.Pass();
 
   RenderFrameDevToolsAgentHost::OnCancelPendingNavigation(
       pending_render_frame_host.get(),
       render_frame_host_.get());
 
   // We no longer need to prevent the process from exiting.
   pending_render_frame_host->GetProcess()->RemovePendingView();
 
-  pending_web_ui_.reset();
-  pending_and_current_web_ui_.reset();
-
   return pending_render_frame_host.Pass();
 }
 
 scoped_ptr<RenderFrameHostImpl> RenderFrameHostManager::SetRenderFrameHost(
     scoped_ptr<RenderFrameHostImpl> render_frame_host) {
   // Swap the two.
   scoped_ptr<RenderFrameHostImpl> old_render_frame_host =
       render_frame_host_.Pass();
   render_frame_host_ = render_frame_host.Pass();
 
@@ skipping 154 matching lines @@
     if (rvh && !rvh->IsRenderViewLive()) {
       EnsureRenderViewInitialized(rvh, instance);
     } else {
       // Create a swapped out RenderView in the given SiteInstance if none
       // exists. Since an opener can point to a subframe, do this on the root
       // frame of the current opener's frame tree.
       if (SiteIsolationPolicy::IsSwappedOutStateForbidden()) {
         frame_tree->root()->render_manager()->CreateRenderFrameProxy(instance);
       } else {
         frame_tree->root()->render_manager()->CreateRenderFrame(
-            instance, nullptr, CREATE_RF_SWAPPED_OUT | CREATE_RF_HIDDEN,
-            nullptr);
+            instance, CREATE_RF_SWAPPED_OUT | CREATE_RF_HIDDEN, nullptr);
       }
     }
   }
 }
 
 int RenderFrameHostManager::GetOpenerRoutingID(SiteInstance* instance) {
   if (!frame_tree_node_->opener())
     return MSG_ROUTING_NONE;
 
   return frame_tree_node_->opener()
       ->render_manager()
       ->GetRoutingIdForSiteInstance(instance);
 }
 
 }  // namespace content