Fixes regression when opening tabs in background with pinned tabs

chrome/browser/ui/tabs/tab_strip_model.cc

Index: chrome/browser/ui/tabs/tab_strip_model.cc
diff --git a/chrome/browser/ui/tabs/tab_strip_model.cc b/chrome/browser/ui/tabs/tab_strip_model.cc
index 08671ff46422047cf7dab27b5cb6f18005bcd170..7a751eecaf3cec5f7ad14c3af04995b664cc35b1 100644
--- a/chrome/browser/ui/tabs/tab_strip_model.cc
+++ b/chrome/browser/ui/tabs/tab_strip_model.cc
@@ -606,8 +606,12 @@ int TabStripModel::GetIndexOfLastWebContentsOpenedBy(const WebContents* opener,
   for (int i = start_index + 1; i < count(); ++i) {
     // Test opened by transitively, i.e. include tabs opened by tabs opened by
     // opener, etc. Stop when we find the first non-descendant.
-    if (!opener_and_descendants.count(contents_data_[i]->opener()))
+    if (!opener_and_descendants.count(contents_data_[i]->opener())) {
+      // Skip over pinned tabs as new tabs are added after pinned tabs.
+      if (contents_data_[i]->pinned())
+        continue;
       break;
+    }
     opener_and_descendants.insert(contents_data_[i]->web_contents());
     last_index = i;
   }