Add an --enable-container-culling commandline flag.

content/renderer/web_preferences.cc

 // Copyright 2013 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.
 
 #include "content/public/renderer/web_preferences.h"
 
 #include "base/strings/utf_string_conversions.h"
 #include "third_party/WebKit/public/platform/WebString.h"
 #include "third_party/WebKit/public/platform/WebURL.h"
 #include "third_party/WebKit/public/web/WebKit.h"
@@ skipping 213 matching lines @@
       !prefs.antialiased_2d_canvas_disabled);
 
   // Set MSAA sample count for 2d canvas if requested on the command line (or
   // default value if not).
   settings->setAccelerated2dCanvasMSAASampleCount(
       prefs.accelerated_2d_canvas_msaa_sample_count);
 
   // Enable deferred filter rendering if requested on the command line.
   settings->setDeferredFiltersEnabled(prefs.deferred_filters_enabled);
 
+  // Enable container culling if requested on the command line.
+  settings->setContainerCullingEnabled(prefs.container_culling_enabled);
+
   // Enable gesture tap highlight if requested on the command line.
   settings->setGestureTapHighlightEnabled(prefs.gesture_tap_highlight_enabled);
 
   // Enabling accelerated layers from the command line enabled accelerated
   // 3D CSS, Video, and Animations.
   settings->setAcceleratedCompositingFor3DTransformsEnabled(
       prefs.accelerated_compositing_for_3d_transforms_enabled);
   settings->setAcceleratedCompositingForVideoEnabled(
       prefs.accelerated_compositing_for_video_enabled);
   settings->setAcceleratedCompositingForAnimationEnabled(
@@ skipping 112 matching lines @@
   settings->setPinchVirtualViewportEnabled(
       prefs.pinch_virtual_viewport_enabled);
 
   settings->setPinchOverlayScrollbarThickness(
       prefs.pinch_overlay_scrollbar_thickness);
   settings->setUseSolidColorScrollbars(prefs.use_solid_color_scrollbars);
   settings->setCompositorTouchHitTesting(prefs.compositor_touch_hit_testing);
 }
 
 }  // namespace content