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| 1 // Copyright 2016 The Chromium Authors. All rights reserved. | 1 // Copyright 2016 The Chromium Authors. All rights reserved. | 
| 2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be | 
| 3 // found in the LICENSE file. | 3 // found in the LICENSE file. | 
| 4 | 4 | 
| 5 typedef (OffscreenCanvasRenderingContext2D or | 5 typedef (OffscreenCanvasRenderingContext2D or | 
| 6          WebGLRenderingContext or | 6          WebGLRenderingContext or | 
| 7          WebGL2RenderingContext) OffscreenRenderingContext; | 7          WebGL2RenderingContext) OffscreenRenderingContext; | 
| 8 | 8 | 
| 9 partial interface OffscreenCanvas { | 9 partial interface OffscreenCanvas { | 
| 10     [CallWith=ScriptState, RaisesException, RuntimeEnabled=ExperimentalCanvasFea
    tures] OffscreenRenderingContext? getContext(DOMString contextId, optional Canva
    sContextCreationAttributes attributes); | 10     [CallWith=ScriptState, RaisesException, RuntimeEnabled=ExperimentalCanvasFea
    tures] OffscreenRenderingContext? getContext(DOMString contextId, optional Canva
    sContextCreationAttributes attributes); | 
|  | 11 | 
|  | 12     [RaisesException, CallWith=ScriptState] Promise<Blob> convertToBlob(optional
     ImageEncodeOptions options); | 
| 11 }; | 13 }; | 
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