b77acbf30b
(Essentially a re-issue of https://github.com/flutter/flutter/pull/174682 which ended up with broken Google Testing links) We had 2 different implementations of the rendering code for the performance overlay layer. The skia version used some skia-specific code to render the overlay incrementally into an offscreen surface and so we created a different implementation for Impeller that only uses standard rendering calls (and no surface cache). It turns out that the Impeller version was faster anyway even on Skia so it is a simple change to delete the old code and always use the new visualizer. The new visualizer reduces the time to render the graph from just under 1ms to about .1ms on Skia. The new visualizer takes .1ms longer to compute on the UI thread, but overall we save time between the 2 threads. The new visualizer is much faster on Impeller. Some work could be done to save some of that time on the UI thread by only incrementally updating the graph data, but for now we can take the ~.8-.9ms savings with just some deleted code.
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