win: Add BrowserWindow.setThumbarButtons API.

atom/browser/api/atom_api_window.h

@@ -14,6 +14,10 @@
 #include "atom/browser/native_window_observer.h"
 #include "native_mate/handle.h"
 
+#if defined(OS_WIN)
+#include "atom/browser/ui/win/thumbar_host.h"
+#endif
+
 class GURL;
 
 namespace gfx {
@@ -129,6 +133,10 @@ class Window : public mate::TrackableObject<Window>,
   void SetProgressBar(double progress);
   void SetOverlayIcon(const gfx::Image& overlay,
                       const std::string& description);
+#if defined(OS_WIN)
+  void SetThumbarButtons(
+      const std::vector<ThumbarHost::ThumbarButton>& buttons);
+#endif
   void SetMenu(v8::Isolate* isolate, v8::Local<v8::Value> menu);
   void SetAutoHideMenuBar(bool auto_hide);
   bool IsMenuBarAutoHide();