script_bindings: Assert that serializable/transferable types have accurate WebIDL annotations (#38615)

These changes add compile-time assertions that:
* any type that implements the Serializable/Transferable trait has a
`[Serializable]` or `[Transferable]` annotation in the interface WebIDL
* any WebIDL interface with the `[Serializable]` or `[Transferable]`
annotation implements the corresponding trait

This is useful because it means that WebIDL definitions will be less
confusing if you're trying to figure out whether Servo supports
serializing/transferring a particular interface type. It also makes
fixing #21715 in the future a little bit easier, because the annotations
will remain up to date.

Testing: compile-time only; no point in writing tests for this since it
involves webidl codegen.

---------

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

components/script_bindings/webidls/Blob.webidl

@@ -4,7 +4,7 @@
 
 // https://w3c.github.io/FileAPI/#blob
 
-[Exposed=(Window,Worker)]
+[Exposed=(Window,Worker), Serializable]
 interface Blob {
   [Throws] constructor(optional sequence<BlobPart> blobParts,
     optional BlobPropertyBag options = {});

components/script_bindings/webidls/CanvasRenderingContext2D.webidl

@@ -269,7 +269,7 @@ dictionary ImageDataSettings {
 };
 
 [Exposed=(Window,Worker),
- Serializable]
+ /*Serializable*/]
 interface ImageData {
   [Throws] constructor(unsigned long sw, unsigned long sh, optional ImageDataSettings settings = {});
   [Throws] constructor(ImageDataArray data, unsigned long sw,

components/script_bindings/webidls/CryptoKey.webidl

@@ -8,7 +8,7 @@ enum KeyType { "public", "private", "secret" };
 
 enum KeyUsage { "encrypt", "decrypt", "sign", "verify", "deriveKey", "deriveBits", "wrapKey", "unwrapKey" };
 
-[SecureContext, Exposed=(Window,Worker), Serializable, Pref="dom_crypto_subtle_enabled"]
+[SecureContext, Exposed=(Window,Worker), /*Serializable,*/ Pref="dom_crypto_subtle_enabled"]
 interface CryptoKey {
   readonly attribute KeyType type;
   readonly attribute boolean extractable;

components/script_bindings/webidls/DOMException.webidl

@@ -9,7 +9,8 @@
 
 [
   ExceptionClass,
-  Exposed=(Window,Worker,Worklet,DissimilarOriginWindow)
+  Exposed=(Window,Worker,Worklet,DissimilarOriginWindow),
+  Serializable,
 ]
 interface DOMException {
   [Throws] constructor(optional DOMString message="", optional DOMString name="Error");

components/script_bindings/webidls/DOMPoint.webidl

@@ -10,7 +10,8 @@
  */
 
 // http://dev.w3.org/fxtf/geometry/Overview.html#dompoint
-[Exposed=(Window,Worker,PaintWorklet)]
+[Exposed=(Window,Worker,PaintWorklet),
+ Serializable]
 interface DOMPoint : DOMPointReadOnly {
     [Throws] constructor(optional unrestricted double x = 0, optional unrestricted double y = 0,
                 optional unrestricted double z = 0, optional unrestricted double w = 1);

components/script_bindings/webidls/DOMPointReadOnly.webidl

@@ -10,7 +10,8 @@
  */
 
 // http://dev.w3.org/fxtf/geometry/Overview.html#dompointreadonly
-[Exposed=(Window,Worker,PaintWorklet)]
+[Exposed=(Window,Worker,PaintWorklet),
+ Serializable]
 interface DOMPointReadOnly {
     [Throws] constructor(optional unrestricted double x = 0, optional unrestricted double y = 0,
                 optional unrestricted double z = 0, optional unrestricted double w = 1);

components/script_bindings/webidls/DOMRect.webidl

@@ -5,7 +5,7 @@
 // https://drafts.fxtf.org/geometry/#domrect
 
 [Exposed=(Window,Worker),
- Serializable,
+ /*Serializable,*/
  LegacyWindowAlias=SVGRect]
 interface DOMRect : DOMRectReadOnly {
     [Throws] constructor(optional unrestricted double x = 0, optional unrestricted double y = 0,

components/script_bindings/webidls/DOMRectReadOnly.webidl

@@ -5,7 +5,7 @@
 // https://drafts.fxtf.org/geometry/#domrect
 
 [Exposed=(Window,Worker),
- Serializable]
+ /*Serializable*/]
 interface DOMRectReadOnly {
   [Throws] constructor(optional unrestricted double x = 0, optional unrestricted double y = 0,
               optional unrestricted double width = 0, optional unrestricted double height = 0);

components/script_bindings/webidls/MessagePort.webidl

@@ -6,7 +6,7 @@
  * https://html.spec.whatwg.org/multipage/#messageport
  */
 
-[Exposed=(Window,Worker)]
+[Exposed=(Window,Worker), Transferable]
 interface MessagePort : EventTarget {
   [Throws] undefined postMessage(any message, sequence<object> transfer);
   [Throws] undefined postMessage(any message, optional StructuredSerializeOptions options = {});

components/script_bindings/webidls/ReadableStream.webidl

@@ -4,7 +4,7 @@
 
 // https://streams.spec.whatwg.org/#readablestream
 
-[Exposed=*] // [Transferable] - See Bug 1562065
+[Exposed=*, Transferable]
 interface _ReadableStream {
   [Throws]
   constructor(optional object underlyingSource, optional QueuingStrategy strategy = {});

components/script_bindings/webidls/TransformStream.webidl

@@ -6,7 +6,7 @@
  * https://streams.spec.whatwg.org/#ts-class-definition
  */
 
-[Exposed=*] // [Transferable] - See Bug 1562065
+[Exposed=*, Transferable]
 interface TransformStream {
   [Throws]
   constructor(optional object transformer,

components/script_bindings/webidls/WebGPU.webidl

@@ -170,7 +170,7 @@ interface GPUDevice: EventTarget {
 };
 GPUDevice includes GPUObjectBase;
 
-[Exposed=(Window, DedicatedWorker), Serializable, Pref="dom_webgpu_enabled"]
+[Exposed=(Window, DedicatedWorker), /*Serializable,*/ Pref="dom_webgpu_enabled"]
 interface GPUBuffer {
     readonly attribute GPUSize64Out size;
     readonly attribute GPUFlagsConstant usage;
@@ -222,7 +222,7 @@ namespace GPUMapMode {
     const GPUFlagsConstant WRITE = 0x0002;
 };
 
-[Exposed=(Window, DedicatedWorker), Serializable , Pref="dom_webgpu_enabled"]
+[Exposed=(Window, DedicatedWorker), /*Serializable,*/ Pref="dom_webgpu_enabled"]
 interface GPUTexture {
     [Throws, NewObject]
     GPUTextureView createView(optional GPUTextureViewDescriptor descriptor = {});
@@ -458,7 +458,7 @@ enum GPUCompareFunction {
     "always"
 };
 
-[Exposed=(Window, DedicatedWorker), Serializable, Pref="dom_webgpu_enabled"]
+[Exposed=(Window, DedicatedWorker), /*Serializable,*/ Pref="dom_webgpu_enabled"]
 interface GPUBindGroupLayout {
 };
 GPUBindGroupLayout includes GPUObjectBase;
@@ -479,7 +479,7 @@ dictionary GPUBindGroupLayoutEntry {
 };
 
 typedef [EnforceRange] unsigned long GPUShaderStageFlags;
-[Exposed=(Window, DedicatedWorker), Serializable, Pref="dom_webgpu_enabled"]
+[Exposed=(Window, DedicatedWorker), /*Serializable,*/ Pref="dom_webgpu_enabled"]
 interface GPUShaderStage {
     const GPUShaderStageFlags VERTEX = 1;
     const GPUShaderStageFlags FRAGMENT = 2;
@@ -560,7 +560,7 @@ dictionary GPUBufferBinding {
     GPUSize64 size;
 };
 
-[Exposed=(Window, DedicatedWorker), Serializable, Pref="dom_webgpu_enabled"]
+[Exposed=(Window, DedicatedWorker), /*Serializable,*/ Pref="dom_webgpu_enabled"]
 interface GPUPipelineLayout {
 };
 GPUPipelineLayout includes GPUObjectBase;
@@ -569,7 +569,7 @@ dictionary GPUPipelineLayoutDescriptor : GPUObjectDescriptorBase {
     required sequence<GPUBindGroupLayout> bindGroupLayouts;
 };
 
-[Exposed=(Window, DedicatedWorker), Serializable, Pref="dom_webgpu_enabled"]
+[Exposed=(Window, DedicatedWorker), /*Serializable,*/ Pref="dom_webgpu_enabled"]
 interface GPUShaderModule {
     Promise<GPUCompilationInfo> getCompilationInfo();
 };
@@ -638,7 +638,7 @@ dictionary GPUProgrammableStage {
 
 typedef double GPUPipelineConstantValue; // May represent WGSL's bool, f32, i32, u32, and f16 if enabled.
 
-[Exposed=(Window, DedicatedWorker), Serializable, Pref="dom_webgpu_enabled"]
+[Exposed=(Window, DedicatedWorker), /*Serializable,*/ Pref="dom_webgpu_enabled"]
 interface GPUComputePipeline {
 };
 GPUComputePipeline includes GPUObjectBase;
@@ -648,7 +648,7 @@ dictionary GPUComputePipelineDescriptor : GPUPipelineDescriptorBase {
     required GPUProgrammableStage compute;
 };
 
-[Exposed=(Window, DedicatedWorker), Serializable, Pref="dom_webgpu_enabled"]
+[Exposed=(Window, DedicatedWorker), /*Serializable,*/ Pref="dom_webgpu_enabled"]
 interface GPURenderPipeline {
 };
 GPURenderPipeline includes GPUObjectBase;
@@ -873,7 +873,7 @@ dictionary GPUImageCopyExternalImage {
     boolean flipY = false;
 };
 
-[Exposed=(Window, DedicatedWorker), Serializable, Pref="dom_webgpu_enabled"]
+[Exposed=(Window, DedicatedWorker), /*Serializable,*/ Pref="dom_webgpu_enabled"]
 interface GPUCommandBuffer {
 };
 GPUCommandBuffer includes GPUObjectBase;
@@ -881,7 +881,7 @@ GPUCommandBuffer includes GPUObjectBase;
 dictionary GPUCommandBufferDescriptor : GPUObjectDescriptorBase {
 };
 
-[Exposed=(Window, DedicatedWorker), Serializable, Pref="dom_webgpu_enabled"]
+[Exposed=(Window, DedicatedWorker), /*Serializable,*/ Pref="dom_webgpu_enabled"]
 interface GPUCommandEncoder {
     [NewObject]
     GPUComputePassEncoder beginComputePass(optional GPUComputePassDescriptor descriptor = {});
@@ -939,7 +939,7 @@ dictionary GPUCommandEncoderDescriptor : GPUObjectDescriptorBase {
     boolean measureExecutionTime = false;
 };
 
-[Exposed=(Window, DedicatedWorker), Serializable, Pref="dom_webgpu_enabled"]
+[Exposed=(Window, DedicatedWorker), /*Serializable,*/ Pref="dom_webgpu_enabled"]
 interface GPUComputePassEncoder {
     undefined setPipeline(GPUComputePipeline pipeline);
     undefined dispatchWorkgroups(GPUSize32 x, optional GPUSize32 y = 1, optional GPUSize32 z = 1);
@@ -1090,7 +1090,7 @@ dictionary GPURenderBundleEncoderDescriptor : GPURenderPassLayout {
     boolean stencilReadOnly = false;
 };
 
-[Exposed=(Window, DedicatedWorker), Serializable, Pref="dom_webgpu_enabled"]
+[Exposed=(Window, DedicatedWorker), /*Serializable,*/ Pref="dom_webgpu_enabled"]
 interface GPUQueue {
     undefined submit(sequence<GPUCommandBuffer> buffers);
 
@@ -1119,7 +1119,7 @@ interface GPUQueue {
 };
 GPUQueue includes GPUObjectBase;
 
-[Exposed=(Window, DedicatedWorker), Serializable, Pref="dom_webgpu_enabled"]
+[Exposed=(Window, DedicatedWorker), /*Serializable,*/ Pref="dom_webgpu_enabled"]
 interface GPUQuerySet {
     undefined destroy();
 };

components/script_bindings/webidls/WritableStream.webidl

@@ -4,7 +4,7 @@
 
 // https://streams.spec.whatwg.org/#writablestream
 
-[Exposed=*] // [Transferable] - See Bug 1562065
+[Exposed=*, Transferable]
 interface WritableStream {
   [Throws]
   constructor(optional object underlyingSink, optional QueuingStrategy strategy = {});