Ensure that Service Worker clients are always returned in MRU order (1)

content/browser/frame_host/frame_tree_node.h

Index: content/browser/frame_host/frame_tree_node.h
diff --git a/content/browser/frame_host/frame_tree_node.h b/content/browser/frame_host/frame_tree_node.h
index c56f21dd8ebb3a2ab72c96b9ed6628bf2a484bff..2d033a65db6f56f0f7ad88b946186f2f8457c79c 100644
--- a/content/browser/frame_host/frame_tree_node.h
+++ b/content/browser/frame_host/frame_tree_node.h
@@ -203,6 +203,12 @@ class CONTENT_EXPORT FrameTreeNode {
   // FrameTree::ForEach to stop all loads in the entire FrameTree.
   bool StopLoading();
 
+  // Returns the time this frame was last focused.
+  base::TimeTicks last_focus_time() const { return last_focus_time_; }
+  void set_last_focus_time(const base::TimeTicks& last_focus_time) {
+    last_focus_time_ = last_focus_time;
+  }
+
  private:
   class OpenerDestroyedObserver;
 
@@ -281,6 +287,8 @@ class CONTENT_EXPORT FrameTreeNode {
   // List of objects observing this FrameTreeNode.
   base::ObserverList<Observer> observers_;
 
+  base::TimeTicks last_focus_time_;
+
   DISALLOW_COPY_AND_ASSIGN(FrameTreeNode);
 };