pathfinder: Use trace for canvas_text with 2 frames

The existing trace had only one frame, in which the rendering was
together with the setup (shaders, etc).

This caused for continuous growing of resources when looping over the
last frame when tracking performance, as resources were created but not
released.

By rendering twice, we have a first frame with setup+rendering, and a
second one that just renders. This frame is more amenable for using for
performance tracking.

To take this frame, the application had to be modified with the patch in
this commit (0001-canvas-text-Render-twice.patch).

Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Part-of: <!36>
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