libcef:

- Add support for embedded netscape-style plugins.
- Add new webkit_glue VisitedLinkHash() and IsLinkVisited() functions required by underlying chromium changes.
cefclient:
- Add sample netscape-style plugin implementation and related Plugin item on the Tests menu.
- Increase the speed of the update timer so that buttons refresh closer to real-time.

git-svn-id: https://chromiumembedded.googlecode.com/svn/trunk@5 5089003a-bbd8-11dd-ad1f-f1f9622dbc98

libcef/browser_webkit_glue.cc

@@ -150,4 +150,12 @@ std::string GetDocumentString(WebFrame* frame) {
   return StringToStdString(WebCore::createMarkup(core_frame->document()));
 }
 
+uint64 VisitedLinkHash(const char* canonical_url, size_t length) {
+  return 0;
+}
+
+bool IsLinkVisited(uint64 link_hash) {
+  return false;
+}
+
 }  // namespace webkit_glue