[MD settings] separator line for side nav

chrome/browser/resources/settings/settings_menu/settings_menu.html

Index: chrome/browser/resources/settings/settings_menu/settings_menu.html
diff --git a/chrome/browser/resources/settings/settings_menu/settings_menu.html b/chrome/browser/resources/settings/settings_menu/settings_menu.html
index e1dee73fa682ab96f6dbfe8e5193c9700b7aab1f..e7b8e339f08f90dc9aa6624eaa4d6bc3b63db6a2 100644
--- a/chrome/browser/resources/settings/settings_menu/settings_menu.html
+++ b/chrome/browser/resources/settings/settings_menu/settings_menu.html
@@ -66,6 +66,14 @@
         font-weight: 500;
         min-height: 40px;
       }
+
+      .menu-top-margin {
+        margin-top: 8px;

[tommycli, 2016/05/06 18:23:48]

Does it work if you put margin-bottom on every "paper-submenu div" rule?

[dschuyler, 2016/05/06 23:58:24]

Done.

+      }
+
+      .underbar {
+        border-bottom: 1px solid rgba(0, 0, 0, 0.08);

[tommycli, 2016/05/06 18:23:48]

Alan really doesn't want to use the default --settings-separator-line here? If
so maybe add a comment calling this out as a special separator line.

If you follow the above suggestion (about the paper-submenu div rule) you might
need an extra margin on this element also, but I think that's more explicit.

[dschuyler, 2016/05/06 23:58:24]

Done.

+      }
     </style>
     <paper-menu name="root-menu">
       <paper-submenu data-page="basic" id="basicPage">
@@ -112,7 +120,8 @@
         </paper-menu>
       </paper-submenu>
       <paper-submenu id="advancedPage" data-page="advanced">
-        <div class="menu-trigger" data-section="" on-tap="openPage_">
+        <div class="menu-top-margin menu-trigger" data-section=""
+            on-tap="openPage_">
           <span i18n-content="advancedPageTitle"></span>
           <iron-icon icon="[[arrowState_(advancedOpened_)]]" item-icon>
           </iron-icon>
@@ -163,8 +172,9 @@
           </div>
         </paper-menu>
       </paper-submenu>
+      <div class="menu-top-margin underbar"></div>
       <paper-submenu on-tap="openPage_">
-        <div class="menu-trigger">
+        <div class="menu-top-margin menu-trigger">
           <span i18n-content="aboutProgram"></span>
         </div>
       </paper-submenu>