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/string_visitor_cpptoc.cc

@@ -13,6 +13,8 @@
 #include "libcef_dll/cpptoc/string_visitor_cpptoc.h"
 
 
+namespace {
+
 // MEMBER FUNCTIONS - Body may be edited by hand.
 
 void CEF_CALLBACK string_visitor_visit(struct _cef_string_visitor_t* self,
@@ -29,13 +31,20 @@ void CEF_CALLBACK string_visitor_visit(struct _cef_string_visitor_t* self,
       CefString(string));
 }
 
+}  // namespace
+
 
 // CONSTRUCTOR - Do not edit by hand.
 
-CefStringVisitorCppToC::CefStringVisitorCppToC(CefStringVisitor* cls)
-    : CefCppToC<CefStringVisitorCppToC, CefStringVisitor, cef_string_visitor_t>(
-        cls) {
-  struct_.struct_.visit = string_visitor_visit;
+CefStringVisitorCppToC::CefStringVisitorCppToC() {
+  GetStruct()->visit = string_visitor_visit;
+}
+
+template<> CefRefPtr<CefStringVisitor> CefCppToC<CefStringVisitorCppToC,
+    CefStringVisitor, cef_string_visitor_t>::UnwrapDerived(CefWrapperType type,
+    cef_string_visitor_t* s) {
+  NOTREACHED() << "Unexpected class type: " << type;
+  return NULL;
 }
 
 #ifndef NDEBUG
@@ -43,3 +52,5 @@ template<> base::AtomicRefCount CefCppToC<CefStringVisitorCppToC,
     CefStringVisitor, cef_string_visitor_t>::DebugObjCt = 0;
 #endif
 
+template<> CefWrapperType CefCppToC<CefStringVisitorCppToC, CefStringVisitor,
+    cef_string_visitor_t>::kWrapperType = WT_STRING_VISITOR;