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 db7d0647a2a8807e8d06ca90b059145b4050bec6..4d7f92c09c1d0f73fc9e6d64ca1e6d46ae621ee2 100644
--- a/content/browser/frame_host/render_frame_host_impl.cc
+++ b/content/browser/frame_host/render_frame_host_impl.cc
@@ -841,6 +841,7 @@ 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)
@@ -2467,6 +2468,11 @@ 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) {