Make window.open() IPCs be frame-based

content/common/frame_messages.h

Index: content/common/frame_messages.h
diff --git a/content/common/frame_messages.h b/content/common/frame_messages.h
index 63aadc0f239560ce871bf6cbfa7ed757ece8d496..7b7d50f9be09c74440885d8fb5a68198fc6a61e8 100644
--- a/content/common/frame_messages.h
+++ b/content/common/frame_messages.h
@@ -571,6 +571,16 @@ IPC_STRUCT_BEGIN(FrameHostMsg_ShowPopup_Params)
 IPC_STRUCT_END()
 #endif
 
+// Causes a window previously opened via RenderMessageFilter::CreateNewWindow to
+// be shown on the screen. This message is routed to the preexisting frame that
+// opened the window, and |pending_widget_routing_id| corresponds to the
+// widget routing id from the CreateNewWindow reply.
+IPC_MESSAGE_ROUTED4(FrameHostMsg_ShowCreatedWindow,
+                    int /* pending_widget_routing_id */,
+                    WindowOpenDisposition /* disposition */,
+                    gfx::Rect /* initial_rect */,
+                    bool /* opened_by_user_gesture */)
+
 #if BUILDFLAG(ENABLE_PLUGINS)
 IPC_STRUCT_TRAITS_BEGIN(content::PepperRendererInstanceData)
   IPC_STRUCT_TRAITS_MEMBER(render_process_id)