Stop disabling force_compositing_mode for background RenderViews.

content/renderer/render_widget.h

Index: content/renderer/render_widget.h
diff --git a/content/renderer/render_widget.h b/content/renderer/render_widget.h
index 411d102a3aa0fa7d9e6f1afc645171d020f8a7e9..a8adc6c8827343c26a6e7d9c34dd8a99020dd6ab 100644
--- a/content/renderer/render_widget.h
+++ b/content/renderer/render_widget.h
@@ -265,7 +265,8 @@ class CONTENT_EXPORT RenderWidget
   RenderWidget(blink::WebPopupType popup_type,
                const blink::WebScreenInfo& screen_info,
                bool swapped_out,
-               bool hidden);
+               bool hidden,
+               bool never_visible);
 
   virtual ~RenderWidget();
 
@@ -620,6 +621,9 @@ class CONTENT_EXPORT RenderWidget
   // Indicates that we shouldn't bother generated paint events.
   bool is_hidden_;
 
+  // Indicates that we are never visible, so never produce graphical output.
+  bool never_visible_;
+
   // Indicates that we are in fullscreen mode.
   bool is_fullscreen_;