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gltrace: flush trace buffer on createContext & makeCurrent
Certain apps (e.g. chrome) seem to create contexts which are unused for long periods of time. If tracing is stopped before those contexts are used, then the debugger never gets to know that these contexts were created. Flushing the trace after these calls ensures that the debugger knows about all created/used contexts. Change-Id: I01baa11aa56ac89eddce3c2851e4bf01076984d1