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[Impeller] Maintain separate queues of GLES operations for each threa…
…d in the reactor (flutter#56573) Threads that add operations to the ReactorGLES assume that those operations will be executed serially. But prior to this change, the ReactorGLES added all operations into one queue. The reactor would then execute those operations on any thread that can react. This could cause operations that were added to the reactor on the raster thread to be submitted to the GPU on the IO thread (or vice versa). The reactor does not wait for the GPU to finish execution of those operations. So other operations added on the raster thread could be submitted by a reaction before the GPU has completed the operation that was submitted on the IO thread. This PR ensures that operations added to the reactor on a given thread will be executed during a reaction on that same thread. If the thread can not currently react, then the operations will be queued until the thread enables reactions. This also adds a call to CommandBuffer::WaitUntilScheduled to ImageDecoderImpeller. This ensures that the command buffer submitted on the IO thread is flushed before the image is returned. Fixes flutter/flutter#158535 Fixes flutter/flutter#158388 Fixes flutter/flutter#158390
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