Field trial removing tiles from NTP if URL is already open - for 1993 clients

chrome/browser/ui/tabs/tab_strip_model_utils.cc

Index: chrome/browser/ui/tabs/tab_strip_model_utils.cc
diff --git a/chrome/browser/ui/tabs/tab_strip_model_utils.cc b/chrome/browser/ui/tabs/tab_strip_model_utils.cc
index 2605dd7532e361f432d4f0e4eb20c5f57b37a003..ed09b85658dde0e6e330b97716d7913342d35246 100644
--- a/chrome/browser/ui/tabs/tab_strip_model_utils.cc
+++ b/chrome/browser/ui/tabs/tab_strip_model_utils.cc
@@ -4,7 +4,9 @@
 
 #include "chrome/browser/ui/tabs/tab_strip_model_utils.h"
 
+#include "chrome/browser/history/top_sites.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
+#include "content/public/browser/web_contents.h"
 
 namespace chrome {
 
@@ -18,4 +20,14 @@ int IndexOfFirstBlockedTab(const TabStripModel* model) {
   return model->count();
 }
 
+void GetOpenUrls(const TabStripModel& tabs,
+                 const history::TopSites& top_sites,
+                 std::set<std::string>* urls) {
+  for (int i = 0; i < tabs.count(); ++i) {
+    content::WebContents* web_contents = tabs.GetWebContentsAt(i);
+    if (web_contents)
+      urls->insert(top_sites.GetCanonicalURLString(web_contents->GetURL()));
+  }
+}
+
 }  // namespace chrome