IDL: make optional arguments (without default) explicit sometimes

Source/core/html/canvas/CanvasRenderingContext2D.idl

 /*
  * Copyright (C) 2006 Apple Computer, Inc.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 70 matching lines @@
     attribute unrestricted float shadowBlur;
     [TreatNullAs=NullString] attribute DOMString shadowColor;
 
     // rects
     void clearRect(unrestricted float x, unrestricted float y, unrestricted float width, unrestricted float height);
     void fillRect(unrestricted float x, unrestricted float y, unrestricted float width, unrestricted float height);
     void strokeRect(unrestricted float x, unrestricted float y, unrestricted float width, unrestricted float height);
 
     // path API (see also CanvasPathMethods)
     void beginPath();
-    void fill(optional CanvasFillRule winding);
-    [RuntimeEnabled=Path2D] void fill(Path2D path, optional CanvasFillRule winding);
+    void fill(optional CanvasFillRule fillRule = "nonzero");
+    [RuntimeEnabled=Path2D] void fill(Path2D path, optional CanvasFillRule fillRule = "nonzero");
     void stroke();
     [RuntimeEnabled=Path2D] void stroke(Path2D path);
     // Focus rings
     void drawFocusIfNeeded(Element element);
     [RuntimeEnabled=Path2D] void drawFocusIfNeeded(Path2D path, Element element);
 
     [RuntimeEnabled=ExperimentalCanvasFeatures] void scrollPathIntoView(optional Path2D path);
-    void clip(optional CanvasFillRule winding);
-    [RuntimeEnabled=Path2D] void clip(Path2D path, optional CanvasFillRule winding);
-    boolean isPointInPath(unrestricted float x, unrestricted float y, optional CanvasFillRule winding);
-    [RuntimeEnabled=Path2D] boolean isPointInPath(Path2D path, unrestricted float x, unrestricted float y, optional CanvasFillRule winding);
+    void clip(optional CanvasFillRule fillRule = "nonzero");
+    [RuntimeEnabled=Path2D] void clip(Path2D path, optional CanvasFillRule fillRule = "nonzero");
+    boolean isPointInPath(unrestricted float x, unrestricted float y, optional CanvasFillRule fillRule = "nonzero");
+    [RuntimeEnabled=Path2D] boolean isPointInPath(Path2D path, unrestricted float x, unrestricted float y, optional CanvasFillRule fillRule = "nonzero");
     boolean isPointInStroke(unrestricted float x, unrestricted float y);
     [RuntimeEnabled=Path2D] boolean isPointInStroke(Path2D path, unrestricted float x, unrestricted float y);
 
     // text (see also the CanvasDrawingStyles interface)
     void fillText(DOMString text, unrestricted float x, unrestricted float y, optional unrestricted float maxWidth);
     void strokeText(DOMString text, unrestricted float x, unrestricted float y, optional unrestricted float maxWidth);
     TextMetrics measureText(DOMString text);
 
     // drawing images
     [RaisesException] void drawImage(HTMLImageElement image, unrestricted float x, unrestricted float y);
@@ skipping 49 matching lines @@
     // Non-standard APIs. Candidates for deprecation
     // https://developer.mozilla.org/en/docs/Web/API/CanvasRenderingContext2D
     [MeasureAs=CanvasRenderingContext2DSetAlpha] void setAlpha(unrestricted float alpha);
     [MeasureAs=CanvasRenderingContext2DSetCompositeOperation] void setCompositeOperation(DOMString compositeOperation);
     [MeasureAs=CanvasRenderingContext2DSetLineWidth] void setLineWidth(unrestricted float width);
     [MeasureAs=CanvasRenderingContext2DSetLineCap] void setLineCap(DOMString cap);
     [MeasureAs=CanvasRenderingContext2DSetLineJoin] void setLineJoin(DOMString join);
     [MeasureAs=CanvasRenderingContext2DSetMiterLimit] void setMiterLimit(unrestricted float limit);
     [MeasureAs=CanvasRenderingContext2DClearShadow] void clearShadow();
     [MeasureAs=CanvasRenderingContext2DSetStrokeColor] void setStrokeColor(DOMString color, optional unrestricted float alpha);
-    [MeasureAs=CanvasRenderingContext2DSetStrokeColor] void setStrokeColor(unrestricted float grayLevel, optional unrestricted float alpha);
+    [MeasureAs=CanvasRenderingContext2DSetStrokeColor] void setStrokeColor(unrestricted float grayLevel, optional unrestricted float alpha = 1.0);
     [MeasureAs=CanvasRenderingContext2DSetStrokeColor] void setStrokeColor(unrestricted float r, unrestricted float g, unrestricted float b, unrestricted float a);
     [MeasureAs=CanvasRenderingContext2DSetStrokeColor] void setStrokeColor(unrestricted float c, unrestricted float m, unrestricted float y, unrestricted float k, unrestricted float a);
     [MeasureAs=CanvasRenderingContext2DSetFillColor] void setFillColor(DOMString color, optional unrestricted float alpha);
-    [MeasureAs=CanvasRenderingContext2DSetFillColor] void setFillColor(unrestricted float grayLevel, optional unrestricted float alpha);
+    [MeasureAs=CanvasRenderingContext2DSetFillColor] void setFillColor(unrestricted float grayLevel, optional unrestricted float alpha = 1.0);
     [MeasureAs=CanvasRenderingContext2DSetFillColor] void setFillColor(unrestricted float r, unrestricted float g, unrestricted float b, unrestricted float a);
     [MeasureAs=CanvasRenderingContext2DSetFillColor] void setFillColor(unrestricted float c, unrestricted float m, unrestricted float y, unrestricted float k, unrestricted float a);
     [MeasureAs=CanvasRenderingContext2DDrawImageFromRect] void drawImageFromRect(
         HTMLImageElement? image, optional unrestricted float sx, optional unrestricted float sy, optional unrestricted float sw, optional unrestricted float sh,
         optional unrestricted float dx, optional unrestricted float dy, optional unrestricted float dw, optional unrestricted float dh, optional DOMString compositeOperation);
     [MeasureAs=CanvasRenderingContext2DSetShadow] void setShadow(unrestricted float width, unrestricted float height, unrestricted float blur, optional DOMString color, optional unrestricted float alpha);
-    [MeasureAs=CanvasRenderingContext2DSetShadow] void setShadow(unrestricted float width, unrestricted float height, unrestricted float blur, unrestricted float grayLevel, optional unrestricted float alpha);
+    [MeasureAs=CanvasRenderingContext2DSetShadow] void setShadow(unrestricted float width, unrestricted float height, unrestricted float blur, unrestricted float grayLevel, optional unrestricted float alpha = 1.0);
     [MeasureAs=CanvasRenderingContext2DSetShadow] void setShadow(unrestricted float width, unrestricted float height, unrestricted float blur, unrestricted float r, unrestricted float g, unrestricted float b, unrestricted float a);
     [MeasureAs=CanvasRenderingContext2DSetShadow] void setShadow(unrestricted float width, unrestricted float height, unrestricted float blur, unrestricted float c, unrestricted float m, unrestricted float y, unrestricted float k, unrestricted float a);
 };
 
 CanvasRenderingContext2D implements CanvasPathMethods;