Bug 1529724 [wpt PR 15428] - Update interfaces/webgl1.idl, a=testonly

Automatic update from web-platform-tests
Update interfaces/webgl1.idl (#15428)

Source: https://github.com/tidoust/reffy-reports/blob/9c32f49/whatwg/idl/webgl1.idl
Build: https://travis-ci.org/tidoust/reffy-reports/builds/494128798
--

wpt-commits: 2bed10ac31899a4812f7e1d32ac69ade0bbe7f4f
wpt-pr: 15428

UltraBlame original commit: d60d45526348b7711d4bfcbbf75bcaea934bec4b

testing/web-platform/tests/interfaces/webgl1.idl

@@ -221,32 +221,32 @@ performance
 dictionary
 WebGLContextAttributes
 {
-GLboolean
+boolean
 alpha
 =
 true
 ;
-GLboolean
+boolean
 depth
 =
 true
 ;
-GLboolean
+boolean
 stencil
 =
 false
 ;
-GLboolean
+boolean
 antialias
 =
 true
 ;
-GLboolean
+boolean
 premultipliedAlpha
 =
 true
 ;
-GLboolean
+boolean
 preserveDrawingBuffer
 =
 false
@@ -258,7 +258,7 @@ powerPreference
 default
 "
 ;
-GLboolean
+boolean
 failIfMajorPerformanceCaveat
 =
 false
@@ -448,6 +448,8 @@ or
 HTMLCanvasElement
 or
 HTMLVideoElement
+or
+OffscreenCanvas
 )
 TexImageSource
 ;
@@ -2650,7 +2652,21 @@ Window
 ]
 readonly
 attribute
+(
 HTMLCanvasElement
+or
+OffscreenCanvas
+)
+canvas
+;
+[
+Exposed
+=
+Worker
+]
+readonly
+attribute
+OffscreenCanvas
 canvas
 ;
 readonly