Use process per site instance for "Instant".

chrome/browser/search/search.h

Index: chrome/browser/search/search.h
diff --git a/chrome/browser/search/search.h b/chrome/browser/search/search.h
index f7630a5978bacc58f8156c4c854cdbf710f39ba8..7f1bf7823427a786d65bffd81b8d005d35a3b74e 100644
--- a/chrome/browser/search/search.h
+++ b/chrome/browser/search/search.h
@@ -75,6 +75,9 @@ string16 GetSearchTerms(const content::WebContents* contents);
 // Returns true if |url| should be rendered in the Instant renderer process.
 bool ShouldAssignURLToInstantRenderer(const GURL& url, Profile* profile);
 
+// Returns true if the Instant |url| should use process per site.
+bool ShouldUseProcessPerSiteForInstantURL(const GURL& url, Profile* profile);
+
 // Returns true if the visible entry of |contents| is a New Tab Page rendered
 // by Instant. A page that matches the search or Instant URL of the default
 // search provider but does not have any search terms is considered an Instant