Desktop aura: Put x11 cache in aura, instead of ui/base/x/.

ui/base/x/x11_atom_cache.h

-// 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.
-
-#ifndef UI_BASE_X_X11_ATOM_CACHE_H_
-#define UI_BASE_X_X11_ATOM_CACHE_H_
-
-#include "base/basictypes.h"
-#include "base/memory/singleton.h"
-#include "ui/base/ui_export.h"
-
-#include <X11/Xlib.h>
-
-#include <map>
-
-// Get rid of a macro from Xlib.h that conflicts with Aura's RootWindow class.
-#undef RootWindow
-
-namespace ui {
-
-// Names of cached atoms that we fetch from X11AtomCache. Adding an entry here
-// also requires adding an entry in the cc file.
-enum AtomName {
-  ATOM_WM_DELETE_WINDOW = 0,
-  ATOM__NET_WM_MOVERESIZE,
-  ATOM__NET_WM_PING,
-  ATOM__NET_WM_PID,
-  ATOM_WM_S0,
-  ATOM__MOTIF_WM_HINTS,
-
-  ATOM_COUNT
-};
-
-// Pre-caches all Atoms on first use to minimize roundtrips to the X11
-// server. Assumes that we only have a single X11 display,
-// base::MessagePumpX::GetDefaultXDisplay().
-class UI_EXPORT X11AtomCache {
- public:
-  static X11AtomCache* GetInstance();
-
-  // Returns the pre-interned Atom by enum instead of string.
-  ::Atom GetAtom(AtomName name) const;
-
- private:
-  friend struct DefaultSingletonTraits<X11AtomCache>;
-
-  // Constructor performs all interning
-  X11AtomCache();
-  ~X11AtomCache();
-
-  std::map<AtomName, ::Atom> cached_atoms_;
-
-  DISALLOW_COPY_AND_ASSIGN(X11AtomCache);
-};
-
-}  // namespace ui
-
-#endif  // UI_BASE_X_ATOM_CACHE_H_