Update nested OOPIF's screen rects when parent is repositioned in page.

content/browser/frame_host/frame_tree.h

Index: content/browser/frame_host/frame_tree.h
diff --git a/content/browser/frame_host/frame_tree.h b/content/browser/frame_host/frame_tree.h
index 3255d3bc093a35545c068df978ba50789cae2bdb..3daf95ad5339b2dd7fa72346bfef16e1e9f33b5f 100644
--- a/content/browser/frame_host/frame_tree.h
+++ b/content/browser/frame_host/frame_tree.h
@@ -75,9 +75,9 @@ class CONTENT_EXPORT FrameTree {
    private:
     friend class FrameTree;
 
-    NodeRange(FrameTree* tree, FrameTreeNode* node_to_skip);
+    NodeRange(FrameTreeNode* root, FrameTreeNode* node_to_skip);
 
-    FrameTree* const tree_;
+    FrameTreeNode* const root_;
     FrameTreeNode* const node_to_skip_;
   };
 
@@ -111,9 +111,9 @@ class CONTENT_EXPORT FrameTree {
    private:
     friend class FrameTree;
 
-    ConstNodeRange(const FrameTree* tree);
+    ConstNodeRange(const FrameTreeNode* root);
 
-    const FrameTree* const tree_;
+    const FrameTreeNode* const root_;
   };
 
   // Each FrameTreeNode will default to using the given |navigator| for
@@ -148,6 +148,10 @@ class CONTENT_EXPORT FrameTree {
   // breadth-first traversal order.
   NodeRange Nodes();
 
+  // Returns a range to iterate over all FrameTreeNodes in a subtree of the
+  // frame tree, starting from |subtree_root|.
+  NodeRange SubtreeNodes(FrameTreeNode* subtree_root);
+
   // Returns a range to iterate over all FrameTreeNodes in the frame tree in
   // breadth-first traversal order. All FrameTreeNodes returned will be const.
   ConstNodeRange ConstNodes() const;