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Calling ClientWebGLContext::UniformData() many times causes the command buffer to fill up and we spend a fair amount of time flushing the old buffer and allocating a new one, as well as serializing the values. The uniforms themselves are very small but they add up over a large number of calls. We already have some code to track whether the uniform values are dirty to avoid some redundancy, but a) this doesn't cover every uniform, and b) we invalidate them all when switching program. This patch makes us track the value of every uniform that gets set dynamically, and tracks the values separately for each program used. It then uses these to avoid calling UniformData redundantly. Differential Revision: https://phabricator.services.mozilla.com/D190269
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