Implement all system menu title row buttons for Ash MD

ash/common/system/tiles/tiles_default_view.cc

Index: ash/common/system/tiles/tiles_default_view.cc
diff --git a/ash/common/system/tiles/tiles_default_view.cc b/ash/common/system/tiles/tiles_default_view.cc
index f84f6dc1a22c45e8f62606921423597907f14cd7..620b210c97043d3c079953f2ce59f041c8e4c886 100644
--- a/ash/common/system/tiles/tiles_default_view.cc
+++ b/ash/common/system/tiles/tiles_default_view.cc
@@ -12,12 +12,14 @@
 #include "ash/common/system/tray/system_tray_delegate.h"
 #include "ash/common/system/tray/system_tray_item.h"
 #include "ash/common/system/tray/tray_constants.h"
+#include "ash/common/system/tray/tray_utils.h"
 #include "ash/common/wm_shell.h"
 #include "ash/resources/vector_icons/vector_icons.h"
 #include "grit/ash_strings.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/gfx/geometry/insets.h"
 #include "ui/views/border.h"
+#include "ui/views/controls/button/custom_button.h"
 #include "ui/views/controls/separator.h"
 #include "ui/views/layout/box_layout.h"
 
@@ -36,8 +38,9 @@ const char kHebrewLocale[] = "he";
 
 namespace ash {
 
-TilesDefaultView::TilesDefaultView(SystemTrayItem* owner)
+TilesDefaultView::TilesDefaultView(SystemTrayItem* owner, LoginStatus login)
     : owner_(owner),
+      login_(login),
       settings_button_(nullptr),
       help_button_(nullptr),
       lock_button_(nullptr),
@@ -64,12 +67,17 @@ void TilesDefaultView::Init() {
       views::BoxLayout::CROSS_AXIS_ALIGNMENT_CENTER);
   SetLayoutManager(box_layout);
 
-  if (shell->system_tray_delegate()->ShouldShowSettings()) {
-    settings_button_ = new SystemMenuButton(this, kSystemMenuSettingsIcon,
-                                            IDS_ASH_STATUS_TRAY_SETTINGS);
-    AddChildView(settings_button_);
-    AddSeparator();
-  }
+  // Show the buttons in this row as disabled if the user is at the login
+  // screen, lock screen, or in a secondary account flow. The exception is
+  // |power_button_| which is always shown as enabled.
+  const bool disable_buttons = !CanOpenWebUISettings(login_);
+
+  settings_button_ = new SystemMenuButton(this, kSystemMenuSettingsIcon,
+                                          IDS_ASH_STATUS_TRAY_SETTINGS);
+  if (disable_buttons || !shell->system_tray_delegate()->ShouldShowSettings())
+    settings_button_->SetState(views::Button::STATE_DISABLED);
+  AddChildView(settings_button_);
+  AddSeparator();
 
   help_button_ =
       new SystemMenuButton(this, kSystemMenuHelpIcon, IDS_ASH_STATUS_TRAY_HELP);
@@ -80,21 +88,23 @@ void TilesDefaultView::Init() {
     // flipping must be disabled. (crbug.com/475237)
     help_button_->EnableCanvasFlippingForRTLUI(false);
   }
+  if (disable_buttons)
+    help_button_->SetState(views::Button::STATE_DISABLED);
   AddChildView(help_button_);
+  AddSeparator();
 
 #if !defined(OS_WIN)
-  if (shell->GetSessionStateDelegate()->CanLockScreen()) {
-    AddSeparator();
-    lock_button_ = new SystemMenuButton(this, kSystemMenuLockIcon,
-                                        IDS_ASH_STATUS_TRAY_LOCK);
-    AddChildView(lock_button_);
-  }
+  lock_button_ =
+      new SystemMenuButton(this, kSystemMenuLockIcon, IDS_ASH_STATUS_TRAY_LOCK);
+  if (disable_buttons || !shell->GetSessionStateDelegate()->CanLockScreen())
+    lock_button_->SetState(views::Button::STATE_DISABLED);
 
+  AddChildView(lock_button_);
   AddSeparator();
+
   power_button_ = new SystemMenuButton(this, kSystemMenuPowerIcon,
                                        IDS_ASH_STATUS_TRAY_SHUTDOWN);
   AddChildView(power_button_);
-
   SystemTrayDelegate* system_tray_delegate = shell->system_tray_delegate();
   system_tray_delegate->AddShutdownPolicyObserver(this);
   system_tray_delegate->ShouldRebootOnShutdown(base::Bind(