Deliver IPC messages together with SwapCompositorFrame

content/browser/web_contents/web_contents_impl.cc

Index: content/browser/web_contents/web_contents_impl.cc
diff --git a/content/browser/web_contents/web_contents_impl.cc b/content/browser/web_contents/web_contents_impl.cc
index b02984b877e81175d44226033125e7bff05f4c42..3e0407ed6b2f2f913650e35f660d0a26c2aff40d 100644
--- a/content/browser/web_contents/web_contents_impl.cc
+++ b/content/browser/web_contents/web_contents_impl.cc
@@ -510,6 +510,8 @@ bool WebContentsImpl::OnMessageReceived(RenderViewHost* render_view_host,
                         OnMediaPlayingNotification)
     IPC_MESSAGE_HANDLER(FrameHostMsg_MediaPausedNotification,
                         OnMediaPausedNotification)
+    IPC_MESSAGE_HANDLER(FrameHostMsg_WidgetVisibleStateChanged,
+                        OnWidgetVisibleStateChanged)
     IPC_MESSAGE_HANDLER(ViewHostMsg_DidLoadResourceFromMemoryCache,
                         OnDidLoadResourceFromMemoryCache)
     IPC_MESSAGE_HANDLER(ViewHostMsg_DidDisplayInsecureContent,
@@ -1692,6 +1694,15 @@ void WebContentsImpl::OnMoveValidationMessage(
     delegate_->MoveValidationMessage(this, anchor_in_root_view);
 }
 
+void WebContentsImpl::OnWidgetVisibleStateChanged(
+    WidgetVisibleState widget_visible_state) {
+  if (widget_visible_state ==
+      WIDGET_VISIBLE_STATE_FIRST_VISUALLY_NON_EMPTY_LAYOUT) {
+    FOR_EACH_OBSERVER(
+        WebContentsObserver, observers_, DidFirstVisuallyNonEmptyPaint());
+  }
+}
+
 void WebContentsImpl::DidSendScreenRects(RenderWidgetHostImpl* rwh) {
   if (browser_plugin_embedder_)
     browser_plugin_embedder_->DidSendScreenRects();