Stop disabling force_compositing_mode for background RenderViews.

chrome/browser/tab_contents/background_contents.h

Index: chrome/browser/tab_contents/background_contents.h
diff --git a/chrome/browser/tab_contents/background_contents.h b/chrome/browser/tab_contents/background_contents.h
index b186a86f95dbf6875f8fdb618ace118084336f03..7ba1dcf4f09bb2967a738bdc4feb9ba9cfd5e262 100644
--- a/chrome/browser/tab_contents/background_contents.h
+++ b/chrome/browser/tab_contents/background_contents.h
@@ -65,6 +65,8 @@ class BackgroundContents : public content::WebContentsDelegate,
                               const gfx::Rect& initial_pos,
                               bool user_gesture,
                               bool* was_blocked) OVERRIDE;
+  virtual bool IsWebContentsNeverVisible(content::WebContents* web_contents)
+      OVERRIDE;

[jam, 2014/04/14 22:43:01]

nit: don't start a line with OVERRIDE. see recent chromium-dev discussion. i
think we're waiting on a new version of clang format which fixes this

[danakj, 2014/04/14 22:47:30]

Yup. Will fix.

 
   // content::WebContentsObserver implementation:
   virtual void RenderProcessGone(base::TerminationStatus status) OVERRIDE;