Add webgpu feature flag (#34444)

* Move script gpu files into webgpu folder

Signed-off-by: atbrakhi <atbrakhi@igalia.com>

* Modify gpu webidls

Signed-off-by: atbrakhi <atbrakhi@igalia.com>

* move gpu realted webidl

Signed-off-by: atbrakhi <atbrakhi@igalia.com>

* add webgpu feature to script

Signed-off-by: atbrakhi <atbrakhi@igalia.com>

* add dummy implementation for gpucanvascontext

Signed-off-by: atbrakhi <atbrakhi@igalia.com>

* fmt

Signed-off-by: atbrakhi <atbrakhi@igalia.com>

* add skip-if CARGO_FEATURE_WEBGPU

Signed-off-by: atbrakhi <atbrakhi@igalia.com>

* Move NavigatorGPU and workerNavigator GPU to webgpu idl

Signed-off-by: atbrakhi <atbrakhi@igalia.com>

* fmt and cleanup

Signed-off-by: atbrakhi <atbrakhi@igalia.com>

* review fix

Signed-off-by: atbrakhi <atbrakhi@igalia.com>

* enable webgpu by default and also some fmt fix

Signed-off-by: atbrakhi <atbrakhi@igalia.com>

* Add pref back, fix imports, small cleanups

Signed-off-by: atbrakhi <atbrakhi@igalia.com>

---------

Signed-off-by: atbrakhi <atbrakhi@igalia.com>

components/constellation/tracing.rs

@@ -183,7 +183,9 @@ mod from_script {
                 Self::ForwardDOMMessage(..) => target!("ForwardDOMMessage"),
                 Self::ScheduleJob(..) => target!("ScheduleJob"),
                 Self::MediaSessionEvent(..) => target!("MediaSessionEvent"),
+                #[cfg(feature = "webgpu")]
                 Self::RequestAdapter(..) => target!("RequestAdapter"),
+                #[cfg(feature = "webgpu")]
                 Self::GetWebGPUChan(..) => target!("GetWebGPUChan"),
                 Self::TitleChanged(..) => target!("TitleChanged"),
             }