Propagate inert state to OOPIFs when a modal dialog is active

content/renderer/render_frame_proxy.cc

Index: content/renderer/render_frame_proxy.cc
diff --git a/content/renderer/render_frame_proxy.cc b/content/renderer/render_frame_proxy.cc
index 0a0ff5333c350ff8024da6ca7f5598b5c9830e34..a6f8d0d98d8d2ca0483cf6027e9ba58c9a35947f 100644
--- a/content/renderer/render_frame_proxy.cc
+++ b/content/renderer/render_frame_proxy.cc
@@ -511,6 +511,10 @@ void RenderFrameProxy::VisibilityChanged(bool visible) {
   Send(new FrameHostMsg_VisibilityChanged(routing_id_, visible));
 }
 
+void RenderFrameProxy::SetIsInert(bool inert) {
+  Send(new FrameHostMsg_SetIsInert(routing_id_, inert));
+}
+
 void RenderFrameProxy::DidChangeOpener(blink::WebFrame* opener) {
   // A proxy shouldn't normally be disowning its opener.  It is possible to get
   // here when a proxy that is being detached clears its opener, in which case