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This is enough to get all of the sample apps running on a conformant ES 3.1 implementation, such as ANGLE/Vk or NVidia's OpenGL ES Linux driver. Implements a new opengl::AdapterDiscoveryOptionsES subclass to specify its creation at adapter discovery time. Adds a "-b opengles" command-line flag to the code samples. Asserts on a call to glShaderStorageBlockBinding() on ES. Works around missing indexed draw buffers support by asserting when a non-0 color attachment is specified. Works around missing glClearTexSubImage() by asserting. :/ These will likely require front-end validation. BUG=dawn:580 Change-Id: I4a4240ca695a22388c55073fd2aee0323cd4afc9 Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/31000 Reviewed-by: Stephen White <senorblanco@chromium.org> Commit-Queue: Stephen White <senorblanco@chromium.org>