CopyExternalImageToTexture: Support copy from webgpu context canvas/offscreenCanvas (#2375)

shaoboyan · web-flow · commit be11fc9a2eb1 · 2021-12-15T09:33:24.000-08:00
Address #2350.
diff --git a/spec/index.bs b/spec/index.bs
@@ -8315,9 +8315,9 @@ GPUQueue includes GPUObjectBase;
             1. If any of the following requirements are unmet, throw an {{OperationError}} and stop.
                 <div class=validusage>
                     - If |source|.{{GPUImageCopyExternalImage/source}} is an {{HTMLCanvasElement}}:
-                        Its [=canvas context mode=] must be `"2d"`, `"webgl"`, or `"webgl2"`.
+                        Its [=canvas context mode=] must be `"2d"`, `"webgl"`, `"webgl2"`, or `"webgpu"`.
                     - If |source|.{{GPUImageCopyExternalImage/source}} is an {{OffscreenCanvas}}:
-                        Its [=OffscreenCanvas context mode=] must be `"2d"`, `"webgl"`, or `"webgl2"`.
+                        Its [=OffscreenCanvas context mode=] must be `"2d"`, `"webgl"`, `"webgl2"`, or `"webgpu"`.
                     - |source|.|origin|.[=Origin3D/x=] + |copySize|.[=Extent3D/width=]
                         must be &le; the width of |sourceImage|.
                     - |source|.|origin|.[=Origin3D/y=] + |copySize|.[=Extent3D/height=]
