Add frame color option to packaged app windows.

apps/ui/native_app_window.h

Index: apps/ui/native_app_window.h
diff --git a/apps/ui/native_app_window.h b/apps/ui/native_app_window.h
index 1668916a3d1d10925abdae1cf82e82dac6fdf423..fe32f53dead366b4537c92647b3e8245dba59233 100644
--- a/apps/ui/native_app_window.h
+++ b/apps/ui/native_app_window.h
@@ -7,6 +7,7 @@
 
 #include "apps/app_window.h"
 #include "components/web_modal/web_contents_modal_dialog_host.h"
+#include "third_party/skia/include/core/SkColor.h"
 #include "ui/base/base_window.h"
 #include "ui/gfx/insets.h"
 
@@ -57,6 +58,10 @@ class NativeAppWindow : public ui::BaseWindow,
   // chrome.app.window.create with the option 'frame' set to 'none'.
   virtual bool IsFrameless() const = 0;
 
+  // Returns information about the window's frame.
+  virtual bool HasFrameColor() const = 0;
+  virtual SkColor FrameColor() const = 0;
+
   // Returns the difference between the window bounds (including titlebar and
   // borders) and the content bounds, if any.
   virtual gfx::Insets GetFrameInsets() const = 0;