gtk: Add gtk_util from Chromium.

browser/ui/gtk/gtk_util.h

@@ -0,0 +1,31 @@
+// 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 ATOM_BROWSER_UI_GTK_GTK_UTIL_H_
+#define ATOM_BROWSER_UI_GTK_GTK_UTIL_H_
+
+#include <gtk/gtk.h>
+#include <string>
+
+namespace gtk_util {
+
+// Left-align the given GtkMisc and return the same pointer.
+GtkWidget* LeftAlignMisc(GtkWidget* misc);
+
+// Create a left-aligned label with the given text in bold.
+GtkWidget* CreateBoldLabel(const std::string& text);
+
+// Checks whether a widget is actually visible, i.e. whether it and all its
+// ancestors up to its toplevel are visible.
+bool IsWidgetAncestryVisible(GtkWidget* widget);
+
+// Sets the given label's size request to |pixel_width|. This will cause the
+// label to wrap if it needs to. The reason for this function is that some
+// versions of GTK mis-align labels that have a size request and line wrapping,
+// and this function hides the complexity of the workaround.
+void SetLabelWidth(GtkWidget* label, int pixel_width);
+
+}  // namespace gtk_util
+
+#endif  // ATOM_BROWSER_UI_GTK_GTK_UTIL_H_