Add generic PaletteDelegate code.

ash/shell/shell_delegate_impl.cc

 // Copyright (c) 2012 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/shell/shell_delegate_impl.h"
 
 #include "ash/app_list/app_list_presenter_delegate_factory.h"
 #include "ash/common/accessibility_delegate.h"
 #include "ash/common/default_accessibility_delegate.h"
 #include "ash/common/gpu_support_stub.h"
 #include "ash/common/media_delegate.h"
 #include "ash/common/new_window_delegate.h"
+#include "ash/common/palette_delegate.h"
 #include "ash/common/session/session_state_delegate.h"
 #include "ash/common/shell_window_ids.h"
 #include "ash/common/system/tray/default_system_tray_delegate.h"
 #include "ash/common/wm/window_state.h"
 #include "ash/default_user_wallpaper_delegate.h"
 #include "ash/pointer_watcher_delegate_aura.h"
 #include "ash/shell.h"
 #include "ash/shell/context_menu.h"
 #include "ash/shell/example_factory.h"
 #include "ash/shell/shelf_delegate_impl.h"
@@ skipping 49 matching lines @@
   void HandleMediaPlayPause() override {}
   void HandleMediaPrevTrack() override {}
   MediaCaptureState GetMediaCaptureState(UserIndex index) override {
     return MEDIA_CAPTURE_VIDEO;
   }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(MediaDelegateImpl);
 };
 
+class PaletteDelegateImpl : public PaletteDelegate {
+ public:
+  PaletteDelegateImpl() {};
+  ~PaletteDelegateImpl() override {};
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(PaletteDelegateImpl);
+};
+
 class SessionStateDelegateImpl : public SessionStateDelegate {
  public:
   SessionStateDelegateImpl()
       : screen_locked_(false), user_info_(new user_manager::UserInfoImpl()) {}
 
   ~SessionStateDelegateImpl() override {}
 
   // SessionStateDelegate:
   int GetMaximumNumberOfLoggedInUsers() const override { return 3; }
   int NumberOfLoggedInUsers() const override {
@@ skipping 144 matching lines @@
 }
 
 ash::NewWindowDelegate* ShellDelegateImpl::CreateNewWindowDelegate() {
   return new NewWindowDelegateImpl;
 }
 
 ash::MediaDelegate* ShellDelegateImpl::CreateMediaDelegate() {
   return new MediaDelegateImpl;
 }
 
+std::unique_ptr<PaletteDelegate> ShellDelegateImpl::CreatePaletteDelegate() {
+  return base::WrapUnique(new PaletteDelegateImpl());
+}
+
 std::unique_ptr<ash::PointerWatcherDelegate>
 ShellDelegateImpl::CreatePointerWatcherDelegate() {
   return base::WrapUnique(new PointerWatcherDelegateAura);
 }
 
 ui::MenuModel* ShellDelegateImpl::CreateContextMenu(WmShelf* wm_shelf,
                                                     const ShelfItem* item) {
   return new ContextMenu(wm_shelf);
 }
 
 GPUSupport* ShellDelegateImpl::CreateGPUSupport() {
   // Real GPU support depends on src/content, so just use a stub.
   return new GPUSupportStub;
 }
 
 base::string16 ShellDelegateImpl::GetProductName() const {
   return base::string16();
 }
 
 gfx::Image ShellDelegateImpl::GetDeprecatedAcceleratorImage() const {
   return gfx::Image();
 }
 
 }  // namespace shell
 }  // namespace ash