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/ctocpp/drag_handler_ctocpp.cc

@@ -19,7 +19,8 @@
 
 bool CefDragHandlerCToCpp::OnDragEnter(CefRefPtr<CefBrowser> browser,
     CefRefPtr<CefDragData> dragData, DragOperationsMask mask) {
-  if (CEF_MEMBER_MISSING(struct_, on_drag_enter))
+  cef_drag_handler_t* _struct = GetStruct();
+  if (CEF_MEMBER_MISSING(_struct, on_drag_enter))
     return false;
 
   // AUTO-GENERATED CONTENT - DELETE THIS COMMENT BEFORE MODIFYING
@@ -34,7 +35,7 @@ bool CefDragHandlerCToCpp::OnDragEnter(CefRefPtr<CefBrowser> browser,
     return false;
 
   // Execute
-  int _retval = struct_->on_drag_enter(struct_,
+  int _retval = _struct->on_drag_enter(_struct,
       CefBrowserCppToC::Wrap(browser),
       CefDragDataCppToC::Wrap(dragData),
       mask);
@@ -44,8 +45,22 @@ bool CefDragHandlerCToCpp::OnDragEnter(CefRefPtr<CefBrowser> browser,
 }
 
 
+// CONSTRUCTOR - Do not edit by hand.
+
+CefDragHandlerCToCpp::CefDragHandlerCToCpp() {
+}
+
+template<> cef_drag_handler_t* CefCToCpp<CefDragHandlerCToCpp, CefDragHandler,
+    cef_drag_handler_t>::UnwrapDerived(CefWrapperType type,
+    CefDragHandler* c) {
+  NOTREACHED() << "Unexpected class type: " << type;
+  return NULL;
+}
+
 #ifndef NDEBUG
 template<> base::AtomicRefCount CefCToCpp<CefDragHandlerCToCpp, CefDragHandler,
     cef_drag_handler_t>::DebugObjCt = 0;
 #endif
 
+template<> CefWrapperType CefCToCpp<CefDragHandlerCToCpp, CefDragHandler,
+    cef_drag_handler_t>::kWrapperType = WT_DRAG_HANDLER;