Aura/GTK integration: Create a small stub library that can talk to GTK.

chrome/browser/themes/theme_service.cc

Index: chrome/browser/themes/theme_service.cc
diff --git a/chrome/browser/themes/theme_service.cc b/chrome/browser/themes/theme_service.cc
index 2fdcb6a1fc7ecae52e2bd3d0a450641f815ea640..4abf8873575caed0d31aa7fded890973fb3165cc 100644
--- a/chrome/browser/themes/theme_service.cc
+++ b/chrome/browser/themes/theme_service.cc
@@ -30,6 +30,10 @@
 #include "ui/views/widget/native_widget_win.h"
 #endif
 
+#if defined(USE_AURA) && !defined(USE_ASH) && defined(OS_LINUX)
+#include "ui/base/linux_ui.h"
+#endif
+
 using content::BrowserThread;
 using content::UserMetricsAction;
 using extensions::Extension;
@@ -241,6 +245,12 @@ const gfx::Image* ThemeService::GetImageNamed(int id) const {
   if (theme_pack_.get())
     image = theme_pack_->GetImageNamed(id);
 
+#if defined(USE_AURA) && !defined(USE_ASH) && defined(OS_LINUX)
+  const ui::LinuxUI* linux_ui = ui::LinuxUI::instance();
+  if (!image && linux_ui)
+    image = linux_ui->GetThemeImageNamed(id);
+#endif
+
   if (!image)
     image = &rb_.GetNativeImageNamed(id);