Don't show media controls when there is a persistent video.

content/browser/renderer_host/render_view_host_delegate.h

Index: content/browser/renderer_host/render_view_host_delegate.h
diff --git a/content/browser/renderer_host/render_view_host_delegate.h b/content/browser/renderer_host/render_view_host_delegate.h
index 7dc40c3f33ae1af42f995ea5932d3bf06e74dee7..3059773f4dac6225a44b05b7f13d9c9f86d7b1e4 100644
--- a/content/browser/renderer_host/render_view_host_delegate.h
+++ b/content/browser/renderer_host/render_view_host_delegate.h
@@ -185,6 +185,9 @@ class CONTENT_EXPORT RenderViewHostDelegate {
   // Whether download UI should be hidden.
   virtual bool HideDownloadUI() const;
 
+  // Whether the WebContents as a persistent video.
+  virtual bool HasPersistentVideo() const;
+
  protected:
   virtual ~RenderViewHostDelegate() {}
 };