Pipe the devTools FrameId from blink into the browser for headless

content/browser/frame_host/render_frame_host_impl.cc

Index: content/browser/frame_host/render_frame_host_impl.cc
diff --git a/content/browser/frame_host/render_frame_host_impl.cc b/content/browser/frame_host/render_frame_host_impl.cc
index 40b9c06845a5d4770f223e4590e979c67260bb04..6882a410a23e3c6b3687e41755f7fdbdacbba46c 100644
--- a/content/browser/frame_host/render_frame_host_impl.cc
+++ b/content/browser/frame_host/render_frame_host_impl.cc
@@ -813,6 +813,7 @@ bool RenderFrameHostImpl::OnMessageReceived(const IPC::Message &msg) {
     IPC_MESSAGE_HANDLER(FrameHostMsg_FocusedNodeChanged, OnFocusedNodeChanged)
     IPC_MESSAGE_HANDLER(FrameHostMsg_SetHasReceivedUserGesture,
                         OnSetHasReceivedUserGesture)
+    IPC_MESSAGE_HANDLER(FrameHostMsg_SetDevToolsFrameId, OnSetDevToolsFrameId)
 #if BUILDFLAG(USE_EXTERNAL_POPUP_MENU)
     IPC_MESSAGE_HANDLER(FrameHostMsg_ShowPopup, OnShowPopup)
     IPC_MESSAGE_HANDLER(FrameHostMsg_HidePopup, OnHidePopup)
@@ -2394,6 +2395,11 @@ void RenderFrameHostImpl::OnSetHasReceivedUserGesture() {
   frame_tree_node_->OnSetHasReceivedUserGesture();
 }
 
+void RenderFrameHostImpl::OnSetDevToolsFrameId(
+    const std::string& devtools_frame_id) {
+  untrusted_devtools_frame_id_ = devtools_frame_id;
+}
+
 #if BUILDFLAG(USE_EXTERNAL_POPUP_MENU)
 void RenderFrameHostImpl::OnShowPopup(
     const FrameHostMsg_ShowPopup_Params& params) {