Don't build testbinding-related code by default (#37034)

Disabling the TestBinding-related bindings and implementations saves 2mb
in a release build. Also, we lost the related test preferences when we
turned the layout-2020 tests on, so the tests have all been failing for
a long time.

Testing: Existing tests in CI.

---------

Signed-off-by: Josh Matthews <josh@joshmatthews.net>

components/script_bindings/Cargo.toml

@@ -52,6 +52,7 @@ serde_json = { workspace = true }
 
 [features]
 bluetooth = []
+testbinding = []
 tracing = ["dep:tracing"]
 webgpu = []
 webxr = ["webxr-api"]

components/script_bindings/webidls/TestBinding.webidl

@@ -2,6 +2,8 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
+// skip-unless CARGO_FEATURE_TESTBINDING
+
 // This interface is entirely internal to Servo, and should not be accessible to
 // web pages.
 

components/script_bindings/webidls/TestBindingIterable.webidl

@@ -2,6 +2,8 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
+// skip-unless CARGO_FEATURE_TESTBINDING
+
 // This interface is entirely internal to Servo, and should not be accessible to
 // web pages.
 

components/script_bindings/webidls/TestBindingMaplikeWithInterface.webidl

@@ -2,6 +2,8 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
+// skip-unless CARGO_FEATURE_TESTBINDING
+
 // This interface is entirely internal to Servo, and should not be accessible to
 // web pages.
 

components/script_bindings/webidls/TestBindingMaplikeWithPrimitive.webidl

@@ -2,6 +2,8 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
+// skip-unless CARGO_FEATURE_TESTBINDING
+
 // This interface is entirely internal to Servo, and should not be accessible to
 // web pages.
 

components/script_bindings/webidls/TestBindingPairIterable.webidl

@@ -2,6 +2,8 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
+// skip-unless CARGO_FEATURE_TESTBINDING
+
 // This interface is entirely internal to Servo, and should not be accessible to
 // web pages.
 

components/script_bindings/webidls/TestBindingProxy.webidl

@@ -1,6 +1,9 @@
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+// skip-unless CARGO_FEATURE_TESTBINDING
+
 /*
  * This IDL file was created to test the special operations (see
  * https://heycam.github.io/webidl/#idl-special-operations) without converting

components/script_bindings/webidls/TestBindingSetlikeWithInterface.webidl

@@ -2,6 +2,8 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
+// skip-unless CARGO_FEATURE_TESTBINDING
+
 // This interface is entirely internal to Servo, and should not be accessible to
 // web pages.
 

components/script_bindings/webidls/TestBindingSetlikeWithPrimitive.webidl

@@ -2,6 +2,8 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
+// skip-unless CARGO_FEATURE_TESTBINDING
+
 // This interface is entirely internal to Servo, and should not be accessible to
 // web pages.
 

components/script_bindings/webidls/TestUtils.webidl

@@ -2,6 +2,8 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
+// skip-unless CARGO_FEATURE_TESTBINDING
+
 // https://testutils.spec.whatwg.org/
 
 [Exposed=(Window,Worker), Pref="dom_testutils_enabled"]

components/script_bindings/webidls/TestWorklet.webidl

@@ -2,6 +2,8 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
+// skip-unless CARGO_FEATURE_TESTBINDING
+
 // This interface is entirely internal to Servo, and should not be accessible to
 // web pages.
 

components/script_bindings/webidls/TestWorkletGlobalScope.webidl

@@ -2,6 +2,8 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
+// skip-unless CARGO_FEATURE_TESTBINDING
+
 // This interface is entirely internal to Servo, and should not be accessible to
 // web pages.