Expose the visibility state of a frame to the browser process.

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 054b039fe8e6613d741c9402e046c0aefe493167..f491c76ffa77b06158e39c77188cea53f5f583a1 100644
--- a/content/browser/frame_host/render_frame_host_impl.cc
+++ b/content/browser/frame_host/render_frame_host_impl.cc
@@ -1564,6 +1564,16 @@ bool RenderFrameHostImpl::IsFocused() {
           frame_tree_->GetFocusedFrame()->IsDescendantOf(frame_tree_node()));
 }
 
+blink::WebPageVisibilityState RenderFrameHostImpl::GetVisibilityState() {
+  blink::WebPageVisibilityState visibility_state =
+      RenderWidgetHostImpl::From(GetView()->GetRenderWidgetHost())->is_hidden()
+          ? blink::WebPageVisibilityStateHidden
+          : blink::WebPageVisibilityStateVisible;
+  GetContentClient()->browser()->OverridePageVisibilityState(this,
+                                                             &visibility_state);
+  return visibility_state;
+}
+
 void RenderFrameHostImpl::UpdateCrossProcessIframeAccessibility(
     const std::map<int32, int>& node_to_frame_routing_id_map) {
   for (const auto& iter : node_to_frame_routing_id_map) {