Gtk3 ui: Add libgtk3ui as a separate build component

chrome/browser/ui/libgtk2ui/gtk2_util.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 CHROME_BROWSER_UI_LIBGTK2UI_GTK2_UTIL_H_
-#define CHROME_BROWSER_UI_LIBGTK2UI_GTK2_UTIL_H_
-
-#include <gtk/gtk.h>
-#include <string>
-
-#include "ui/native_theme/native_theme.h"
-
-class SkBitmap;
-
-namespace aura {
-class Window;
-}
-
-namespace base {
-class CommandLine;
-class Environment;
-}
-
-namespace ui {
-class Accelerator;
-}
-
-namespace libgtk2ui {
-
-void GtkInitFromCommandLine(const base::CommandLine& command_line);
-
-// Returns the name of the ".desktop" file associated with our running process.
-std::string GetDesktopName(base::Environment* env);
-
-guint GetGdkKeyCodeForAccelerator(const ui::Accelerator& accelerator);
-
-GdkModifierType GetGdkModifierForAccelerator(
-    const ui::Accelerator& accelerator);
-
-// Translates event flags into plaform independent event flags.
-int EventFlagsFromGdkState(guint state);
-
-// Style a GTK button as a BlueButton
-void TurnButtonBlue(GtkWidget* button);
-
-// Sets |dialog| as transient for |parent|, which will keep it on top and center
-// it above |parent|. Do nothing if |parent| is NULL.
-void SetGtkTransientForAura(GtkWidget* dialog, aura::Window* parent);
-
-// Gets the transient parent aura window for |dialog|.
-aura::Window* GetAuraTransientParent(GtkWidget* dialog);
-
-// Clears the transient parent for |dialog|.
-void ClearAuraTransientParent(GtkWidget* dialog);
-
-}  // namespace libgtk2ui
-
-#endif  // CHROME_BROWSER_UI_LIBGTK2UI_GTK2_UTIL_H_