Pretty sure it's compiled,I tried it out and it took a while to process on code that ggtags parses in seconds.
I'd imagine it's going to violently shit itself. Chromium has pretty good online code search btw.
Yes, but not the kind of visualization and calling stack shown by SourceTrial. Some of the code is 10 layers deep where the stuff actually happens with many complicated usage of inheritance, which I figure is where this kind of tool can shine.