Added to options page to let users change keyboard mappings.

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

Index: chrome/browser/resources/chromeos/switch_access/options.css
diff --git a/chrome/browser/resources/chromeos/switch_access/options.css b/chrome/browser/resources/chromeos/switch_access/options.css
index fc8d0902d8159913634e31670081a2b5ee5a9ad6..e51ca3bf2ba4f46994f53cda7f405fbf30948cc9 100644
--- a/chrome/browser/resources/chromeos/switch_access/options.css
+++ b/chrome/browser/resources/chromeos/switch_access/options.css
@@ -6,3 +6,26 @@
   clear: left;
   float: left;
 }
+
+.container::after {
+  clear: both;
+  content: '';
+  display: block;
+}
+
+#keyboardMappingDiv * {
+  float: left;
+}
+
+#keyboardMappingDiv label {
+  clear: left;
+}
+
+#keyboardMappingDiv span {
+  white-space: pre-wrap;
+}
+
+#debugKeyMappingDiv {
+  clear: left;
+  display: none;
+}