Stop disabling force_compositing_mode for background RenderViews.

content/public/browser/web_contents_delegate.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_DELEGATE_H_
 #define CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_DELEGATE_H_
 
 #include <set>
 #include <string>
 
@@ skipping 443 matching lines @@
 
   // Notification that the delegate should hide any showing form validation
   // message.
   virtual void HideValidationMessage(WebContents* web_contents) {}
 
   // Notification that the form element that triggered the validation failure
   // has moved.
   virtual void MoveValidationMessage(WebContents* web_contents,
                                      const gfx::Rect& anchor_in_root_view) {}
 
+  // Returns true if the WebContents is never visible.
+  virtual bool IsWebContentsNeverVisible(WebContents* web_contents);

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

nit: since this is on WebContentsDelegate, the "WebContents" in the method name
is redundant. just call it IsNeverVisible

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

Done.

+
  protected:
   virtual ~WebContentsDelegate();
 
  private:
   friend class WebContentsImpl;
 
   // Called when |this| becomes the WebContentsDelegate for |source|.
   void Attach(WebContents* source);
 
   // Called when |this| is no longer the WebContentsDelegate for |source|.
   void Detach(WebContents* source);
 
   // The WebContents that this is currently a delegate for.
   std::set<WebContents*> attached_contents_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_DELEGATE_H_