mt trace: egl: track GL context on a per-thread basis
mt trace: egl: track GL context on a per-thread basis

Wrap EGL context handling calls and keep our own per-thread basis track
of the context object.

Signed-off-by: Imre Deak <fbd5edba1988036c8923f0cca0cce6ac4811db29@intel.com>

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