Implementing promise-based commit for driving OffscreenCanvas animations

third_party/WebKit/Source/modules/offscreencanvas2d/OffscreenCanvasRenderingContext2D.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://html.spec.whatwg.org/multipage/scripting.html#the-offscreen-2d-rendering-context
 
 [
     Exposed=(Window,Worker),
     RuntimeEnabled=ExperimentalCanvasFeatures,
 ] interface OffscreenCanvasRenderingContext2D {
     // back-reference to the canvas
-    [ImplementedAs=getOffscreenCanvas] readonly attribute OffscreenCanvas canvas;
+    [ImplementedAs=offscreenCanvas] readonly attribute OffscreenCanvas canvas;
 
-    [CallWith=ScriptState, RaisesException] void commit();
+    [CallWith=ScriptState, RaisesException] Promise commit();
 
     // state
     void save(); // push state on state stack
     void restore(); // pop state stack and restore state
 
     // transformations (default transform is the identity matrix)
     void scale(unrestricted double x, unrestricted double y);
     void rotate(unrestricted double angle);
     void translate(unrestricted double x, unrestricted double y);
     void transform(unrestricted double a, unrestricted double b, unrestricted double c, unrestricted double d, unrestricted double e, unrestricted double f);
@@ skipping 58 matching lines @@
     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;
 };
 
 OffscreenCanvasRenderingContext2D implements CanvasPathMethods;