-[MTLCommandBuffer commit] may be called while encoding is still in p…

…rogress

https://bugs.webkit.org/show_bug.cgi?id=274275
<radar://128201828>

Reviewed by Dan Glastonbury.

Ensure we don't leave encoders open or commit command buffers
before encoding has ended.

* LayoutTests/TestExpectations:
* LayoutTests/fast/webgpu/fuzz-274275-expected.txt: Added.
* LayoutTests/fast/webgpu/fuzz-274275.html: Added.
Add regression test.

* Source/WebGPU/WebGPU/CommandEncoder.mm:
(WebGPU::CommandEncoder::endEncoding):
(WebGPU::CommandEncoder::runClearEncoder):
* Source/WebGPU/WebGPU/PresentationContextIOSurface.mm:
* Source/WebGPU/WebGPU/Queue.h:
* Source/WebGPU/WebGPU/Queue.mm:
(WebGPU::Queue::~Queue):
(WebGPU::Queue::ensureBlitCommandEncoder):
(WebGPU::Queue::finalizeBlitCommandEncoder):
(WebGPU::Queue::endEncoding const):
(WebGPU::Queue::setEncoderForBuffer):
Centralize endEncoding calls.

Canonical link: https://commits.webkit.org/279008@main

LayoutTests/TestExpectations

@@ -2123,6 +2123,8 @@ webkit.org/b/139639 [ Debug ] cssom/non-subpixel-scroll-top-left-values.html [ S
 [ Release ] fast/webgpu/fuzz-274161.html [ Pass Failure Timeout ]
 [ Debug ] fast/webgpu/fuzz-274271.html [ Skip ]
 [ Release ] fast/webgpu/fuzz-274271.html [ Pass Failure Timeout ]
+[ Debug ] fast/webgpu/fuzz-274275.html [ Skip ]
+[ Release ] fast/webgpu/fuzz-274275.html [ Pass Failure Timeout ]
 
 # Imported W3C HTML/DOM ref tests that are failing.
 imported/w3c/web-platform-tests/html/dom/elements/global-attributes/dir_auto-textarea-script-N-between-Rs.html [ ImageOnlyFailure ]