<chromium> Add FirstVisuallyNonEmptyLayout support for RenderViewObserver

This is needed by the implementation of loadVisuallyCommitted in the QtWebEngine.

Change-Id: Ic0fcdc00f7963ea1088a1ae910bb2dbe26e9e12c
Reviewed-by: Jocelyn Turcotte <[email protected]>

Author: davidsz

chromium/content/public/renderer/render_view_observer.h

@@ -46,6 +46,9 @@ class RenderViewImpl;
 class CONTENT_EXPORT RenderViewObserver : public IPC::Listener,
                                           public IPC::Sender {
  public:
+
+  virtual void OnFirstVisuallyNonEmptyLayout() {}
+
   // By default, observers will be deleted when the RenderView goes away.  If
   // they want to outlive it, they can override this function.
   virtual void OnDestruct();

chromium/content/renderer/render_view_impl.cc

@@ -4105,6 +4105,8 @@ void RenderViewImpl::didFirstVisuallyNonEmptyLayout(WebFrame* frame) {
       InternalDocumentStateData::FromDataSource(frame->dataSource());
   data->set_did_first_visually_non_empty_layout(true);
 
+  FOR_EACH_OBSERVER(RenderViewObserver, observers_, OnFirstVisuallyNonEmptyLayout());
+
 #if defined(OS_ANDROID)
   // Update body background color if necessary.
   SkColor bg_color = webwidget_->backgroundColor();