Put CSS sticky positioning behind a runtime flag until we think it's ready for release.

BUG=145027


Review URL: https://chromiumcodereview.appspot.com/10914321

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@157189 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/content/browser/web_contents/web_contents_impl.cc b/content/browser/web_contents/web_contents_impl.cc
index 54a5e17..43c12ae 100644
--- a/content/browser/web_contents/web_contents_impl.cc
+++ b/content/browser/web_contents/web_contents_impl.cc
@@ -525,6 +525,8 @@
       !command_line.HasSwitch(switches::kDisableAcceleratedVideo);
   prefs.fullscreen_enabled =
       !command_line.HasSwitch(switches::kDisableFullScreen);
+  prefs.css_sticky_position_enabled =
+      command_line.HasSwitch(switches::kEnableExperimentalWebKitFeatures);
   prefs.css_regions_enabled =
       command_line.HasSwitch(switches::kEnableExperimentalWebKitFeatures);
   prefs.css_shaders_enabled =