PlzNavigate: provide the FrameTreeNode ID to the network stack

content/browser/web_contents/web_contents_impl.cc

Index: content/browser/web_contents/web_contents_impl.cc
diff --git a/content/browser/web_contents/web_contents_impl.cc b/content/browser/web_contents/web_contents_impl.cc
index 2a8a92c6b93fc5ff7299201af9e88d660da46596..e5c61bbddde49ea5d641eb0c0395654fa03ce062 100644
--- a/content/browser/web_contents/web_contents_impl.cc
+++ b/content/browser/web_contents/web_contents_impl.cc
@@ -463,6 +463,13 @@ std::vector<WebContentsImpl*> WebContentsImpl::GetAllWebContents() {
   return result;
 }
 
+// static
+WebContentsImpl* WebContentsImpl::FromFrameTreeNode(
+    FrameTreeNode* frame_tree_node) {
+  return static_cast<WebContentsImpl*>(
+      WebContents::FromRenderFrameHost(frame_tree_node->current_frame_host()));
+}
+
 RenderFrameHostManager* WebContentsImpl::GetRenderManagerForTesting() {
   return GetRenderManager();
 }