Better integration of perfetto performance tracing into virglrenderer

Currently, integrating the perfetto tracing framework is a compile time decision, and the tracing calls are always executed. The following issues need to be resolved:

• Using vperfetto_min as interface as it is done now is not very convenient for inclusion in ChromeOS.
• Even when tracing is not enabled, the tracing functions are always called.
• Since the aim is to do host/guest tracing, perfetto must be integrated with Mesa as well.

The approach suggested by perfetto-upstream is to embed the files perfetto.cc/hh into the target software an use the functions and classes provided there. However, both, virglrenderer and Mesa require the implementation of a C wrapper to make the interface in perfetto.hh usable.

Possible approaches to implement this are

• Embed the perfetto files as suggested by upstream and develop the C interface in virglrenderer and Mesa independently. If code can be shared a common library could later be extracted to crate a common library.
• Create the wrapper library as an external tool (similar to vperfetto_min or percetto, and Mesa and virglrenderer to this library on systems that make it easy to install additional libraries, or pull the dependencies in as meson wraps.