Auto merge of #26872 - kunalmohan:gpu-canvas-context, r=kvark,jdm

Implement GPUSwapChain and GPUCanvasContext and interface with Webrender

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r?@kvark

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- [ ] These changes fix #___ (GitHub issue number if applicable)

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- [ ] There are tests for these changes OR
- [ ] These changes do not require tests because ___

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components/layout_2020/dom_traversal.rs

@@ -451,6 +451,7 @@ where
             HTMLCanvasDataSource::Image(ipc_sender) => {
                 CanvasSource::Image(ipc_sender.map(|renderer| Arc::new(Mutex::new(renderer))))
             },
+            HTMLCanvasDataSource::WebGPU(image_key) => CanvasSource::WebGPU(image_key),
         };
         Some((
             CanvasInfo {

components/layout_2020/replaced.rs

@@ -52,6 +52,7 @@ pub(crate) struct IntrinsicSizes {
 pub(crate) enum CanvasSource {
     WebGL(ImageKey),
     Image(Option<Arc<Mutex<IpcSender<CanvasMsg>>>>),
+    WebGPU(ImageKey),
 }
 
 impl fmt::Debug for CanvasSource {
@@ -62,6 +63,7 @@ impl fmt::Debug for CanvasSource {
             match *self {
                 CanvasSource::WebGL(_) => "WebGL",
                 CanvasSource::Image(_) => "Image",
+                CanvasSource::WebGPU(_) => "WebGPU",
             }
         )
     }
@@ -210,6 +212,7 @@ impl ReplacedContent {
 
                 let image_key = match canvas_info.source {
                     CanvasSource::WebGL(image_key) => image_key,
+                    CanvasSource::WebGPU(image_key) => image_key,
                     CanvasSource::Image(ref ipc_renderer) => match *ipc_renderer {
                         Some(ref ipc_renderer) => {
                             let ipc_renderer = ipc_renderer.lock().unwrap();