Add DisplayLayoutManagerMulti (WIP)

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 de3995fb4ddd1b3f91451c78bf65624c5e8a0116..36b6332e43546c57494a8cd542f2d3df7121d8d7 100644
--- a/chrome/browser/resources/options/chromeos/display_options.css
+++ b/chrome/browser/resources/options/chromeos/display_options.css
@@ -93,6 +93,22 @@
   color: rgb(0, 138, 255);
 }
 
+.displays-parent-left {
+  border-left: solid 1px rgb(255, 138, 0);
+}
+
+.displays-parent-right {
+  border-right: solid 1px rgb(255, 138, 0);
+}
+
+.displays-parent-top {
+  border-top: solid 1px rgb(255, 138, 0);
+}
+
+.displays-parent-bottom {
+  border-bottom: solid 1px rgb(255, 138, 0);
+}
+
 #display-options-select-mirroring {
   margin-right: 5px;
 }