Draggable region support for frameless app window on Windows.

content/public/common/common_param_traits.h

Index: content/public/common/common_param_traits.h
diff --git a/content/public/common/common_param_traits.h b/content/public/common/common_param_traits.h
index df0ddc3a6521e3e32e82cebe9c68ba75d50535e0..9094f2756afad88c459c5c785e6aa2fe60f68970 100644
--- a/content/public/common/common_param_traits.h
+++ b/content/public/common/common_param_traits.h
@@ -27,6 +27,7 @@
 class SkBitmap;
 
 namespace content {
+struct DraggableRegion;
 struct Referrer;
 }
 
@@ -229,6 +230,14 @@ struct CONTENT_EXPORT ParamTraits<SkBitmap> {
   static void Log(const param_type& p, std::string* l);
 };
 
+template <>
+struct CONTENT_EXPORT ParamTraits<content::DraggableRegion> {
+  typedef content::DraggableRegion param_type;
+  static void Write(Message* m, const param_type& p);
+  static bool Read(const Message* m, PickleIterator* iter, param_type* p);
+  static void Log(const param_type& p, std::string* l);
+};
+
 }  // namespace IPC
 
 #endif  // CONTENT_PUBLIC_COMMON_COMMON_PARAM_TRAITS_H_