Navigation transitions: Place transition page in same process as destination page.

content/browser/site_instance_impl.cc

Index: content/browser/site_instance_impl.cc
diff --git a/content/browser/site_instance_impl.cc b/content/browser/site_instance_impl.cc
index b6e6918c0a48d755b0ae631270858c440afd3cb0..102c06758f932e4ab86c9c1ae14e7f613c569e3e 100644
--- a/content/browser/site_instance_impl.cc
+++ b/content/browser/site_instance_impl.cc
@@ -241,10 +241,12 @@ SiteInstance* SiteInstance::CreateForURL(BrowserContext* browser_context,
 
 /*static*/
 bool SiteInstance::IsSameWebSite(BrowserContext* browser_context,
-                                 const GURL& real_url1,
-                                 const GURL& real_url2) {
-  GURL url1 = SiteInstanceImpl::GetEffectiveURL(browser_context, real_url1);
-  GURL url2 = SiteInstanceImpl::GetEffectiveURL(browser_context, real_url2);
+                                 const GURL& real_src_url,
+                                 const GURL& real_dest_url) {
+  GURL src_url = SiteInstanceImpl::GetEffectiveURL(browser_context,
+                                                   real_src_url);
+  GURL dest_url = SiteInstanceImpl::GetEffectiveURL(browser_context,
+                                                    real_dest_url);
 
   // We infer web site boundaries based on the registered domain name of the
   // top-level page and the scheme.  We do not pay attention to the port if
@@ -254,20 +256,26 @@ bool SiteInstance::IsSameWebSite(BrowserContext* browser_context,
   // Some special URLs will match the site instance of any other URL. This is
   // done before checking both of them for validity, since we want these URLs
   // to have the same site instance as even an invalid one.
-  if (IsRendererDebugURL(url1) || IsRendererDebugURL(url2))
+  if (IsRendererDebugURL(src_url) || IsRendererDebugURL(dest_url))
     return true;
 
   // If either URL is invalid, they aren't part of the same site.
-  if (!url1.is_valid() || !url2.is_valid())
+  if (!src_url.is_valid() || !dest_url.is_valid())
     return false;
 
+  // If the destination url is just a blank page, we treat them as part of the
+  // same site.
+  GURL blank_page(url::kAboutBlankURL);
+  if (dest_url == blank_page)
+    return true;
+
   // If the schemes differ, they aren't part of the same site.
-  if (url1.scheme() != url2.scheme())
+  if (src_url.scheme() != dest_url.scheme())
     return false;
 
   return net::registry_controlled_domains::SameDomainOrHost(
-      url1,
-      url2,
+      src_url,
+      dest_url,
       net::registry_controlled_domains::INCLUDE_PRIVATE_REGISTRIES);
 }