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content/browser/frame_host/navigator_impl.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/navigator_impl.h"
 
 #include <utility>
 
 #include "base/metrics/histogram.h"
 #include "base/time/time.h"
@@ skipping 484 matching lines @@
         render_frame_host, params.gesture == NavigationGestureUser);
   }
 
   // Update the site of the SiteInstance if it doesn't have one yet, unless
   // assigning a site is not necessary for this URL.  In that case, the
   // SiteInstance can still be considered unused until a navigation to a real
   // page.
   SiteInstanceImpl* site_instance = render_frame_host->GetSiteInstance();
   if (!site_instance->HasSite() &&
       ShouldAssignSiteForURL(params.url)) {
+    // TODO(nick): Is it ever necessary to set the third_party_subframe bit
+    // here?
     site_instance->SetSite(params.url);
   }
 
   // Need to update MIME type here because it's referred to in
   // UpdateNavigationCommands() called by RendererDidNavigate() to
   // determine whether or not to enable the encoding menu.
   // It's updated only for the main frame. For a subframe,
   // RenderView::UpdateURL does not set params.contents_mime_type.
   // (see http://code.google.com/p/chromium/issues/detail?id=2929 )
   // TODO(jungshik): Add a test for the encoding menu to avoid
@@ skipping 616 matching lines @@
   if (pending_entry != controller_->GetVisibleEntry() ||
       !should_preserve_entry) {
     controller_->DiscardPendingEntry(true);
 
     // Also force the UI to refresh.
     controller_->delegate()->NotifyNavigationStateChanged(INVALIDATE_TYPE_URL);
   }
 }
 
 }  // namespace content