Add switch to enable palette tray UI.

ash/common/system/chromeos/palette/palette_tray.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/common/system/chromeos/palette/palette_tray.h"
 
+#include "ash/common/ash_switches.h"
 #include "ash/common/material_design/material_design_controller.h"
 #include "ash/common/shelf/shelf_constants.h"
 #include "ash/common/shelf/wm_shelf.h"
 #include "ash/common/shelf/wm_shelf_util.h"
 #include "ash/common/shell_window_ids.h"
 #include "ash/common/system/chromeos/palette/palette_tool.h"
 #include "ash/common/system/chromeos/palette/palette_tool_manager.h"
 #include "ash/common/system/tray/system_tray_delegate.h"
 #include "ash/common/system/tray/tray_bubble_wrapper.h"
 #include "ash/common/system/tray/tray_constants.h"
 #include "ash/common/system/tray/tray_popup_header_button.h"
 #include "ash/common/wm_lookup.h"
 #include "ash/common/wm_root_window_controller.h"
 #include "ash/common/wm_shell.h"
 #include "ash/common/wm_window.h"
+#include "base/command_line.h"
 #include "base/sys_info.h"
 #include "grit/ash_resources.h"
 #include "grit/ash_strings.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/gfx/paint_vector_icon.h"
 #include "ui/gfx/vector_icons_public.h"
 #include "ui/views/controls/image_view.h"
 #include "ui/views/controls/label.h"
 #include "ui/views/controls/separator.h"
@@ skipping 11 matching lines @@
 
 // Width of the palette itself.
 const int kPaletteWidth = 360;
 
 const int kSeparatorInset = 10;
 
 const int kBubbleViewTopMargin = 7;
 
 // Returns true if the command line flag is present that enables the palette.
 bool IsPaletteEnabled() {
-  // TODO(jdufault): Hookup this function when the flag is in Chrome.
-  return false;
+  return base::CommandLine::ForCurrentProcess()->HasSwitch(
+      ash::switches::kAshEnablePalette);
 }
 
 // Creates a separator.
 views::Separator* CreateSeparator(views::Separator::Orientation orientation) {
   views::Separator* separator =
       new views::Separator(views::Separator::HORIZONTAL);
   separator->SetColor(ash::kBorderDarkColor);
   separator->SetBorder(
       views::Border::CreateEmptyBorder(kSeparatorInset, 0, kSeparatorInset, 0));
   return separator;
@@ skipping 253 matching lines @@
       WmShell::Get()->GetSessionStateDelegate();
 
   SetVisible(!session_state_delegate->IsScreenLocked() &&
              session_state_delegate->GetSessionState() ==
                  SessionStateDelegate::SESSION_STATE_ACTIVE &&
              WmShell::Get()->system_tray_delegate()->GetUserLoginStatus() !=
                  LoginStatus::KIOSK_APP);
 }
 
 }  // namespace ash