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[Impeller] Figure out how to do offscreen MSAA without requiring EXT_multisampled_render_to_texture2 #137569

@jonahwilliams

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@jonahwilliams

This check was added since the way we structure the stencil buffer today doesn't work on Moto G4s. The extension EXT_multisampled_render_to_texture claims it supports depth and stencil buffers, but maybe only with render buffers?

In order to allow the use of multisampled depth and stencil buffers
when performing multisampled rendering to a texture, the extension
also adds the command RenderbufferStorageMultisampleEXT.

We need to resolve this as a Moto G4 is too new for offscreen MSAA to be unsupported

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P1High-priority issues at the top of the work listc: parityWorks on one platform but not anothere: impellerImpeller rendering backend issues and features requeststeam-engineOwned by Engine team

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