Make spacing between uber tray items consistent with UI spec.

ash/system/tray/tray_image_item.cc

Index: ash/system/tray/tray_image_item.cc
diff --git a/ash/system/tray/tray_image_item.cc b/ash/system/tray/tray_image_item.cc
index 449cbd72c7a8d46d3171745b2c1b91be05fc6f59..9d1c80a5251b3cb05552221264d1a4885c826183 100644
--- a/ash/system/tray/tray_image_item.cc
+++ b/ash/system/tray/tray_image_item.cc
@@ -4,6 +4,8 @@
 
 #include "ash/system/tray/tray_image_item.h"
 
+#include "ash/shell.h"
+#include "ash/system/tray/system_tray.h"
 #include "ash/system/tray/tray_item_view.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/gfx/image/image.h"
@@ -31,6 +33,8 @@ views::View* TrayImageItem::CreateTrayView(user::LoginStatus status) {
   tray_view_->image_view()->SetImage(ui::ResourceBundle::GetSharedInstance().
       GetImageNamed(resource_id_).ToImageSkia());
   tray_view_->SetVisible(GetInitialVisibility());
+  UpdateAfterShelfAlignmentChange(
+      ash::Shell::GetInstance()->system_tray()->shelf_alignment());
   return tray_view_;
 }
 
@@ -45,6 +49,10 @@ views::View* TrayImageItem::CreateDetailedView(user::LoginStatus status) {
 void TrayImageItem::UpdateAfterLoginStatusChange(user::LoginStatus status) {
 }
 
+void TrayImageItem::UpdateAfterShelfAlignmentChange(ShelfAlignment alignment) {
+  SetTrayImageItemBorder(tray_view_, alignment);
+}
+
 void TrayImageItem::DestroyTrayView() {
   tray_view_ = NULL;
 }