onnxruntime

9fd928c2 - [WebGPU] Return empty pooling outputs without dispatching (#33668)

[WebGPU] Return empty pooling outputs without dispatching (#33668) ### Description Return empty WebGPU pooling outputs after shape validation and allocation, before constructing a GPU program or dispatch. Add regression coverage for AveragePool, MaxPool and global pooling in NCHW/NHWC, including small/large windows and empty batches, with CPU fallback disabled. ### Motivation and Context An unpadded 65x65 AveragePool window over a nonempty 64x64 input produces an empty output. WebGPU currently attempts a zero-sized dispatch and fails instead of returning that output. Fixes #32841. ### Validation - Native Windows x64, bundled Dawn/D3D12: 85 pooling tests passed; 2 DirectML-only tests skipped. - All 3 new tests (16 scenarios) failed before the fix and passed afterward. - The original issue model passed three repeated runs per layout with full validation and CPU fallback disabled. - Lintrunner and `git diff --check` passed. Metal, browser/Wasm and plugin configurations were not tested.