Implement WebGPU ErrorScopes

[kunalmohan]

This PR covers the following-

1. update wgpu-core (Rustify RenderPipelineDescriptor)
2. Add initial implementation of pushErrorScope and popErrorScope.
3. Use existing BGL if an equivalent already exists.

A brief explanation of the ErrorScope Implementation-

1. We store HashMap<u64, ErrorScopeInfo> in GPUDevice. ErrorScopeInfo is a new struct used to store all necessary info for an ErrorScope.
2. We simultaneously store Vec<u64> to keep track of the ErrorScope hierarchy. next_scope_id is used to get the scope_id for a new Scope.
3. We send the scope_id of top-level scope to the server in the message for an operation. The server performs the operation and sends back the scope_id with the result message (only if a scope_id was sent from the client. Otherwise no message is sent.).
4. We store a HashMap<WebGPUDevice, Dom<GPUDevice>> in GlobalScope to access them from ScriptThread.
5. While creating a GPUDevice we send the PipelineId of the pipeline it was created in so that when the server send the response, we can access the device from the GlobalScope of that Pipeline.
6. We generate the relevant GPUError in GlobalScope(if required) can call the necessary fn in GPUDevice.

This implementation is pretty rough and not complete at all. Broadly the following cases aren't handled at the moment-

1. ErrorFilter is not checked when an error is captured.
2. We don't propagate an error to enclosing scope if a scope did not capture it.
3. UncapturedErrorEvents is not implemented.

As for Equivalent BGLs we now store Vec<(Vec<wgt::BindGroupLayoutEntry>, Dom<GPUBindGroupLayout>)> in GPUDevice and compare Vec<wgt::BindGroupLayoutEntry> for new BGL with the existing ones and return one if it is found. Otherwise a new one is created and an entry added to the Vec.

r?@kvark

---

• ./mach build -d does not report any errors
• ./mach test-tidy does not report any errors

• There are tests for these changes

[highfive]

Heads up! This PR modifies the following files:

• @asajeffrey: components/script/dom/webidls/GPUValidationError.webidl, components/script/dom/gpuadapter.rs, components/script/dom/webidls/GPUOutOfMemoryError.webidl, components/script/dom/gpudevicelostinfo.rs, components/script/dom/bindings/codegen/Bindings.conf and 9 more
• @KiChjang: components/script/dom/webidls/GPUValidationError.webidl, components/script/dom/gpuadapter.rs, components/script/dom/webidls/GPUOutOfMemoryError.webidl, components/script/dom/gpudevicelostinfo.rs, components/script/dom/bindings/codegen/Bindings.conf and 9 more

[highfive]

Warning

• These commits modify script code, but no tests are modified. Please consider adding a test!

[kvark]

I think I understand the code better now, and it's almost there.
Great work! Just one last round

[kvark]

beautiful, thank you!

[kunalmohan]

@kvark I have attempted to solve the GPUDevice cleanup issue. I am not completely happy with this, but this should work until we come up with a better solution.

[kvark]

Looks fine for now, thank you!

[kvark]

@bors-servo r+

[bors-servo]

📌 Commit 785497a has been approved by kvark

[bors-servo]

⌛ Testing commit 785497a with merge 9cd22a0...

[bors-servo]

☀️ Test successful - status-taskcluster
Approved by: kvark
Pushing 9cd22a0 to master...