Add command line switch to enable region based columns.

webkit/renderer/webpreferences_renderer.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 "webkit/renderer/webpreferences_renderer.h"
 
 #include "base/strings/utf_string_conversions.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebKit.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebNetworkStateNotifier.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebRuntimeFeatures.h"
@@ skipping 270 matching lines @@
   settings->setAllowRunningOfInsecureContent(
       prefs.allow_running_insecure_content);
   settings->setPasswordEchoEnabled(prefs.password_echo_enabled);
   settings->setShouldPrintBackgrounds(prefs.should_print_backgrounds);
   settings->setEnableScrollAnimator(prefs.enable_scroll_animator);
   settings->setVisualWordMovementEnabled(prefs.visual_word_movement_enabled);
 
   settings->setCSSStickyPositionEnabled(prefs.css_sticky_position_enabled);
   settings->setExperimentalCSSCustomFilterEnabled(prefs.css_shaders_enabled);
   settings->setExperimentalCSSGridLayoutEnabled(prefs.css_grid_layout_enabled);
+  settings->setRegionBasedColumnsEnabled(prefs.region_based_columns_enabled);
 
   WebRuntimeFeatures::enableLazyLayout(prefs.lazy_layout_enabled);
   WebRuntimeFeatures::enableTouch(prefs.touch_enabled);
   settings->setDeviceSupportsTouch(prefs.device_supports_touch);
   settings->setDeviceSupportsMouse(prefs.device_supports_mouse);
   settings->setEnableTouchAdjustment(prefs.touch_adjustment_enabled);
 
   settings->setFixedPositionCreatesStackingContext(
       prefs.fixed_position_creates_stacking_context);
 
@@ skipping 36 matching lines @@
 
   WebNetworkStateNotifier::setOnLine(prefs.is_online);
   settings->setExperimentalWebSocketEnabled(
       prefs.experimental_websocket_enabled);
   settings->setPinchVirtualViewportEnabled(
       prefs.pinch_virtual_viewport_enabled);
 }
 
 
 }  // namespace webkit_glue