Add generic PaletteDelegate code.

ash/common/wm_shell.cc

Index: ash/common/wm_shell.cc
diff --git a/ash/common/wm_shell.cc b/ash/common/wm_shell.cc
index 5ad467936d6084b6acf71476fb8afad4a51c1659..a2e2ba1e0d0458c30e28350e53683dae4dd65fc0 100644
--- a/ash/common/wm_shell.cc
+++ b/ash/common/wm_shell.cc
@@ -35,6 +35,7 @@
 #include "ui/views/focus/focus_manager_factory.h"
 
 #if defined(OS_CHROMEOS)
+#include "ash/common/palette_delegate.h"
 #include "ash/common/system/chromeos/brightness/brightness_controller_chromeos.h"
 #include "ash/common/system/chromeos/keyboard_brightness_controller.h"
 #include "ash/common/system/chromeos/session/logout_confirmation_controller.h"
@@ -60,6 +61,7 @@ void WmShell::Initialize() {
   // instead of the WmShell constructor.
   accessibility_delegate_.reset(delegate_->CreateAccessibilityDelegate());
   media_delegate_.reset(delegate_->CreateMediaDelegate());
+  palette_delegate_.reset(delegate_->CreatePaletteDelegate());
   toast_manager_.reset(new ToastManager);
 
   // Create the app list item in the shelf data model.