blimp: Update page load status update indicator to use first paint.

content/browser/renderer_host/render_widget_host_delegate.h

Index: content/browser/renderer_host/render_widget_host_delegate.h
diff --git a/content/browser/renderer_host/render_widget_host_delegate.h b/content/browser/renderer_host/render_widget_host_delegate.h
index aa38066ec28b62ea9488ab6ddb2759cfa7d6bdbb..7af1bb8bc686c99f7ae78bbd70347d3231970748 100644
--- a/content/browser/renderer_host/render_widget_host_delegate.h
+++ b/content/browser/renderer_host/render_widget_host_delegate.h
@@ -181,6 +181,11 @@ class CONTENT_EXPORT RenderWidgetHostDelegate {
   // Update the renderer's cache of the screen rect of the view and window.
   virtual void SendScreenRects() {}
 
+  // Notifies that the main frame in the renderer has performed the first paint
+  // after a navigation.
+  virtual void OnFirstPaintAfterLoad(RenderWidgetHostImpl* render_widget_host) {
+  }
+
  protected:
   virtual ~RenderWidgetHostDelegate() {}
 };