ChromeOS: Implement EULA screen of material design OOBE.

chrome/browser/resources/chromeos/login/oobe_dialog_host.css

Index: chrome/browser/resources/chromeos/login/oobe_dialog_host.css
diff --git a/ui/webui/resources/cr_elements/cr_expand_button/cr_expand_button.css b/chrome/browser/resources/chromeos/login/oobe_dialog_host.css
similarity index 73%
copy from ui/webui/resources/cr_elements/cr_expand_button/cr_expand_button.css
copy to chrome/browser/resources/chromeos/login/oobe_dialog_host.css
index 204e397c466ba411b87b0a6b69a838c653041545..59dc512502a2d2a4173c5cbeaaed881ea074c19b 100644
--- a/ui/webui/resources/cr_elements/cr_expand_button/cr_expand_button.css
+++ b/chrome/browser/resources/chromeos/login/oobe_dialog_host.css
@@ -3,5 +3,7 @@
  * found in the LICENSE file. */
 
 :host {
-  display: inline-block;
+  display: flex;
+  flex-direction: column;
+  position: relative;
 }