Move IsRendererTransferNeededForNavigation to RenderFrameHostManager.

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 1486 matching lines @@
   }
 
   // Start the new renderer in a new SiteInstance, but in the current
   // BrowsingInstance.  It is important to immediately give this new
   // SiteInstance to a RenderViewHost (if it is different than our current
   // SiteInstance), so that it is ref counted.  This will happen in
   // CreateRenderView.
   return SiteInstanceDescriptor(browser_context, dest_url, true);
 }
 
+bool RenderFrameHostManager::IsRendererTransferNeededForNavigation(
+    RenderFrameHostImpl* rfh,
+    const GURL& dest_url) {
+  // A transfer is not needed if the current SiteInstance doesn't yet have a
+  // site.  This is the case for tests that use NavigateToURL.
+  if (!rfh->GetSiteInstance()->HasSite())
+    return false;
+
+  // We do not currently swap processes for navigations in webview tag guests.
+  if (rfh->GetSiteInstance()->GetSiteURL().SchemeIs(kGuestScheme))
+    return false;
+
+  GURL effective_url = SiteInstanceImpl::GetEffectiveURL(
+      rfh->GetSiteInstance()->GetBrowserContext(), dest_url);
+
+  // TODO(nasko, nick): These following --site-per-process checks are
+  // overly simplistic. Update them to match all the cases
+  // considered by DetermineSiteInstanceForURL.
+  if (SiteInstance::IsSameWebSite(rfh->GetSiteInstance()->GetBrowserContext(),
+                                  rfh->GetSiteInstance()->GetSiteURL(),
+                                  dest_url)) {
+    return false;  // The same site, no transition needed.
+  }
+
+  // The sites differ. If either one requires a dedicated process,
+  // then a transfer is needed.
+  return rfh->GetSiteInstance()->RequiresDedicatedProcess() ||
+         SiteIsolationPolicy::DoesSiteRequireDedicatedProcess(effective_url);
+}
+
 SiteInstance* RenderFrameHostManager::ConvertToSiteInstance(
     const SiteInstanceDescriptor& descriptor,
     SiteInstance* candidate_instance) {
   SiteInstance* current_instance = render_frame_host_->GetSiteInstance();
 
   // Note: If the |candidate_instance| matches the descriptor, it will already
   // be set to |descriptor.existing_site_instance|.
   if (descriptor.existing_site_instance)
     return descriptor.existing_site_instance;
 
@@ skipping 1075 matching lines @@
 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