Preserve page-level focus for subframe cross-process navigations.

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 3b00607cf0f4973707d6524200d14f85de413b24..56c10992a9ca17b26584ff6d087d190390ef62fd 100644
--- a/content/browser/frame_host/frame_tree.h
+++ b/content/browser/frame_host/frame_tree.h
@@ -152,6 +152,10 @@ class CONTENT_EXPORT FrameTree {
   // in those SiteInstances.
   void ReplicatePageFocus(bool is_focused);
 
+  // Updates page-level focus for this FrameTree in the subframe renderer
+  // identified by |instance|.
+  void SetPageFocus(SiteInstance* instance, bool is_focused);
+
  private:
   FRIEND_TEST_ALL_PREFIXES(RenderFrameHostImplBrowserTest, RemoveFocusedFrame);
   typedef base::hash_map<int, RenderViewHostImpl*> RenderViewHostMap;