Stop disabling force_compositing_mode for background RenderViews.

content/renderer/render_widget.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_RENDERER_RENDER_WIDGET_H_
 #define CONTENT_RENDERER_RENDER_WIDGET_H_
 
 #include <deque>
 #include <map>
 
@@ skipping 247 matching lines @@
   friend class RenderWidgetTest;
 
   enum ResizeAck {
     SEND_RESIZE_ACK,
     NO_RESIZE_ACK,
   };
 
   RenderWidget(blink::WebPopupType popup_type,
                const blink::WebScreenInfo& screen_info,
                bool swapped_out,
-               bool hidden);
+               bool hidden,
+               bool background);
 
   virtual ~RenderWidget();
 
   // Initializes this view with the given opener.  CompleteInit must be called
   // later.
   bool Init(int32 opener_id);
 
   // Called by Init and subclasses to perform initialization.
   bool DoInit(int32 opener_id,
               blink::WebWidget* web_widget,
@@ skipping 334 matching lines @@
   // can be outstanding before we start throttling based on
   // OnSwapBuffersComplete callback.
   static const int kMaxSwapBuffersPending = 2;
 
   // Set to true if we should ignore RenderWidget::Show calls.
   bool did_show_;
 
   // Indicates that we shouldn't bother generated paint events.
   bool is_hidden_;
 
+  // Indeicates that we run in the background and are never visible.

[jam, 2014/04/10 20:27:48]

nit: spelling

[danakj, 2014/04/10 20:37:12]

Done.

+  bool is_background_;
+
   // Indicates that we are in fullscreen mode.
   bool is_fullscreen_;
 
   // Indicates that we should be repainted when restored.  This flag is set to
   // true if we receive an invalidation / scroll event from webkit while our
   // is_hidden_ flag is set to true.  This is used to force a repaint once we
   // restore to account for the fact that our host would not know about the
   // invalidation / scroll event(s) from webkit while we are hidden.
   bool needs_repainting_on_restore_;
 
@@ skipping 151 matching lines @@
 
   ui::MenuSourceType context_menu_source_type_;
   gfx::Point touch_editing_context_menu_location_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidget);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDER_WIDGET_H_