Add createGradient and createPattern to OffscreenCanvas2D in worker

third_party/WebKit/Source/modules/csspaint/PaintRenderingContext2D.idl

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // https://drafts.css-houdini.org/css-paint-api/#paintrenderingcontext2d
 
 [
     Exposed=PaintWorklet,
     RuntimeEnabled=CSSPaintAPI,
 ] interface PaintRenderingContext2D {
@@ skipping 16 matching lines @@
 
     // image smoothing
     attribute boolean imageSmoothingEnabled; // (default True)
     [RuntimeEnabled=ExperimentalCanvasFeatures] attribute ImageSmoothingQuality imageSmoothingQuality; // (default "low")
 
     // colors and styles (see also the CanvasDrawingStyles interface)
     attribute (DOMString or CanvasGradient or CanvasPattern) strokeStyle; // (default black)
     attribute (DOMString or CanvasGradient or CanvasPattern) fillStyle; // (default black)
     CanvasGradient createLinearGradient(double x0, double y0, double x1, double y1);
     [RaisesException] CanvasGradient createRadialGradient(double x0, double y0, double r0, double x1, double y1, double r1);
-    [RaisesException] CanvasPattern? createPattern(CanvasImageSource image, [TreatNullAs=NullString] DOMString repetitionType);
+    [CallWith=ScriptState, RaisesException] CanvasPattern? createPattern(CanvasImageSource image, [TreatNullAs=NullString] DOMString repetitionType);
 
     // shadows
     attribute unrestricted double shadowOffsetX;
     attribute unrestricted double shadowOffsetY;
     attribute unrestricted double shadowBlur;
     attribute DOMString shadowColor;
 
     // rects
     void clearRect(unrestricted double x, unrestricted double y, unrestricted double width, unrestricted double height);
     void fillRect(unrestricted double x, unrestricted double y, unrestricted double width, unrestricted double height);
@@ skipping 24 matching lines @@
     attribute DOMString lineCap; // "butt", "round", "square" (default "butt")
     attribute DOMString lineJoin; // "round", "bevel", "miter" (default "miter")
     attribute unrestricted double miterLimit; // (default 10)
 
     // dashed lines
     void setLineDash(sequence<unrestricted double> dash);
     sequence<unrestricted double> getLineDash();
     attribute unrestricted double lineDashOffset;
 };
 PaintRenderingContext2D implements CanvasPathMethods;