Allow switching between extended and unified

chrome/browser/resources/options/chromeos/display_options.css

Index: chrome/browser/resources/options/chromeos/display_options.css
diff --git a/chrome/browser/resources/options/chromeos/display_options.css b/chrome/browser/resources/options/chromeos/display_options.css
index 73a78e45833622c4636e0c1b3954cfe08023deed..2c000110c9bf9552db2e92249694430c32495cde 100644
--- a/chrome/browser/resources/options/chromeos/display_options.css
+++ b/chrome/browser/resources/options/chromeos/display_options.css
@@ -73,6 +73,10 @@
   margin-right: 10px;
 }
 
+.xxx {

[xiyuan, 2015/05/20 20:17:52]

Is this needed?

+  display: inline-block;
+}
+
 .displays-display {
   -webkit-user-select: none;
   background: rgb(240, 240, 240);
@@ -100,3 +104,8 @@
 .display-options-button {
   width: 130px;
 }
+
+.controlled-setting-with-label,

[xiyuan, 2015/05/20 20:17:51]

This line has side effect because it applies to all elements with
controlled-setting-with-label class. Do we need it?

+.display-options-toggle-unified-desktop-label {
+  display: inline-block;
+}