LibGtkUi: Partition NativeThemeGtk into NativeThemeGtk2 and NativeThemeGtk3

chrome/browser/ui/libgtkui/gtk_util.h

Index: chrome/browser/ui/libgtkui/gtk_util.h
diff --git a/chrome/browser/ui/libgtkui/gtk_util.h b/chrome/browser/ui/libgtkui/gtk_util.h
index 9672becc80a11c9c3909cce03749880944b0cbc9..ab174c20d44d060521c01df5d06b2f5dea3d391e 100644
--- a/chrome/browser/ui/libgtkui/gtk_util.h
+++ b/chrome/browser/ui/libgtkui/gtk_util.h
@@ -25,6 +25,22 @@ class Accelerator;
 
 namespace libgtkui {
 
+extern const SkColor kInvalidColorIdColor;
+extern const SkColor kURLTextColor;
+
+// Generates the normal URL color, a green color used in unhighlighted URL
+// text. It is a mix of |kURLTextColor| and the current text color.  Unlike the
+// selected text color, it is more important to match the qualities of the
+// foreground typeface color instead of taking the background into account.
+SkColor NormalURLColor(SkColor foreground);
+
+// Generates the selected URL color, a green color used on URL text in the
+// currently highlighted entry in the autocomplete popup. It's a mix of
+// |kURLTextColor|, the current text color, and the background color (the
+// select highlight). It is more important to contrast with the background
+// saturation than to look exactly like the foreground color.
+SkColor SelectedURLColor(SkColor foreground, SkColor background);
+
 void GtkInitFromCommandLine(const base::CommandLine& command_line);
 
 // Returns the name of the ".desktop" file associated with our running process.