Add GetImageSkiaNamed to resource_bundle and theme_provider

chrome/browser/ui/gtk/gtk_theme_service.cc

Index: chrome/browser/ui/gtk/gtk_theme_service.cc
diff --git a/chrome/browser/ui/gtk/gtk_theme_service.cc b/chrome/browser/ui/gtk/gtk_theme_service.cc
index 84975ba7bbce25a7f41e857869c772946632d91b..cd6b0ab4a3058aaef2cf370d7c4a72e4465d4daf 100644
--- a/chrome/browser/ui/gtk/gtk_theme_service.cc
+++ b/chrome/browser/ui/gtk/gtk_theme_service.cc
@@ -301,6 +301,12 @@ SkBitmap* GtkThemeService::GetBitmapNamed(int id) const {
   return const_cast<SkBitmap*>(GetImageNamed(id)->ToSkBitmap());
 }
 
+gfx::ImageSkia* GtkThemeService::GetImageSkiaNamed(int id) const {
+  // TODO(pkotwicz): Remove this const cast.  The gfx::Image interface returns
+  // its images const. GetImageSkiaNamed() also should but has many callsites.
+  return const_cast<gfx::ImageSkia*>(GetImageNamed(id)->ToImageSkia());
+}
+
 const gfx::Image* GtkThemeService::GetImageNamed(int id) const {
   // Try to get our cached version:
   ImageCache::const_iterator it = gtk_images_.find(id);