Improve inheritance support in the CEF API (issue #1623).

- Support single parent inheritance in CEF API classes.
- Support non-virtual inheritance in CEF API classes.
- Support translation of CEF API sub-directories.
- Add test sub-directories for testing-only functionality that will be
  available to unit tests but not exposed via the binary distribution.
- Add unit tests for the translator tool.
- Fix parsing of template parameter types that include commas.

libcef_dll/cpptoc/drag_handler_cpptoc.cc

@@ -15,6 +15,8 @@
 #include "libcef_dll/ctocpp/drag_data_ctocpp.h"
 
 
+namespace {
+
 // MEMBER FUNCTIONS - Body may be edited by hand.
 
 int CEF_CALLBACK drag_handler_on_drag_enter(struct _cef_drag_handler_t* self,
@@ -44,12 +46,20 @@ int CEF_CALLBACK drag_handler_on_drag_enter(struct _cef_drag_handler_t* self,
   return _retval;
 }
 
+}  // namespace
+
 
 // CONSTRUCTOR - Do not edit by hand.
 
-CefDragHandlerCppToC::CefDragHandlerCppToC(CefDragHandler* cls)
-    : CefCppToC<CefDragHandlerCppToC, CefDragHandler, cef_drag_handler_t>(cls) {
-  struct_.struct_.on_drag_enter = drag_handler_on_drag_enter;
+CefDragHandlerCppToC::CefDragHandlerCppToC() {
+  GetStruct()->on_drag_enter = drag_handler_on_drag_enter;
+}
+
+template<> CefRefPtr<CefDragHandler> CefCppToC<CefDragHandlerCppToC,
+    CefDragHandler, cef_drag_handler_t>::UnwrapDerived(CefWrapperType type,
+    cef_drag_handler_t* s) {
+  NOTREACHED() << "Unexpected class type: " << type;
+  return NULL;
 }
 
 #ifndef NDEBUG
@@ -57,3 +67,5 @@ template<> base::AtomicRefCount CefCppToC<CefDragHandlerCppToC, CefDragHandler,
     cef_drag_handler_t>::DebugObjCt = 0;
 #endif
 
+template<> CefWrapperType CefCppToC<CefDragHandlerCppToC, CefDragHandler,
+    cef_drag_handler_t>::kWrapperType = WT_DRAG_HANDLER;