[ash-md] Adjusts layout of lists with sticky header rows to match specs

ash/common/system/tray/tray_popup_utils.cc

Index: ash/common/system/tray/tray_popup_utils.cc
diff --git a/ash/common/system/tray/tray_popup_utils.cc b/ash/common/system/tray/tray_popup_utils.cc
index b5e3deb294380a84caf165b59617c1bbc0a1994d..e0f16a3163f6d28302aa665ac5c2ecc35b96ef93 100644
--- a/ash/common/system/tray/tray_popup_utils.cc
+++ b/ash/common/system/tray/tray_popup_utils.cc
@@ -188,6 +188,14 @@ TriView* TrayPopupUtils::CreateDefaultRowView() {
   return tri_view;
 }
 
+TriView* TrayPopupUtils::CreateSubHeaderRowView() {
+  TriView* tri_view = CreateMultiTargetRowView();
+  tri_view->SetInsets(
+      gfx::Insets(0, 0, 0, GetTrayConstant(TRAY_POPUP_ITEM_RIGHT_INSET)));
+  tri_view->SetContainerVisible(TriView::Container::START, false);
+  return tri_view;
+}
+
 TriView* TrayPopupUtils::CreateMultiTargetRowView() {
   TriView* tri_view = new TriView(0 /* padding_between_items */);
 
@@ -427,6 +435,16 @@ views::Separator* TrayPopupUtils::CreateListItemSeparator(bool left_inset) {
   return separator;
 }
 
+views::Separator* TrayPopupUtils::CreateListSubHeaderSeparator() {
+  views::Separator* separator =
+      new views::Separator(views::Separator::HORIZONTAL);
+  separator->SetColor(kHorizontalSeparatorColor);
+  separator->SetPreferredSize(kSeparatorWidth);
+  separator->SetBorder(views::CreateEmptyBorder(
+      kMenuSeparatorVerticalPadding - kSeparatorWidth, 0, 0, 0));
+  return separator;
+}
+
 bool TrayPopupUtils::CanOpenWebUISettings(LoginStatus status) {
   // TODO(tdanderson): Consider moving this into WmShell, or introduce a
   // CanShowSettings() method in each delegate type that has a