Make sure preloaded tabs have unique IDs.

Bug: 5251821
Change-Id: I6dd7561a2461805912268a5faf967199cf39fd8c
diff --git a/src/com/android/browser/Controller.java b/src/com/android/browser/Controller.java
index ff1ad0e..67c42dd 100644
--- a/src/com/android/browser/Controller.java
+++ b/src/com/android/browser/Controller.java
@@ -2168,6 +2168,7 @@
             }
         }
         Tab t = tabControl.getTab();
+        t.refreshIdAfterPreload();
         mTabControl.addPreloadedTab(t);
         addTab(t);
         setActiveTab(t);