Make optional arguments in CanvasRenderingContext2D match the spec [1].

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 12 matching lines @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 enum CanvasWindingRule { "nonzero", "evenodd" };
 
 interface CanvasRenderingContext2D : CanvasRenderingContext {
 
     void save();
     void restore();
 
-    void scale([Default=Undefined] optional float sx,
-               [Default=Undefined] optional float sy);
-    void rotate([Default=Undefined] optional float angle);
-    void translate([Default=Undefined] optional float tx,
-                   [Default=Undefined] optional float ty);
-    void transform([Default=Undefined] optional float m11,
-                   [Default=Undefined] optional float m12,
-                   [Default=Undefined] optional float m21,
-                   [Default=Undefined] optional float m22,
-                   [Default=Undefined] optional float dx,
-                   [Default=Undefined] optional float dy);
-    void setTransform([Default=Undefined] optional float m11,
-                      [Default=Undefined] optional float m12,
-                      [Default=Undefined] optional float m21,
-                      [Default=Undefined] optional float m22,
-                      [Default=Undefined] optional float dx,
-                      [Default=Undefined] optional float dy);
+    void scale(float sx, float sy);
+    void rotate(float angle);
+    void translate(float tx, float ty);
+    void transform(float m11, float m12, float m21, float m22, float dx, float dy);
+    void setTransform(float m11, float m12, float m21, float m22, float dx, float dy);
 
     attribute float globalAlpha;
     [TreatNullAs=NullString] attribute DOMString globalCompositeOperation;
 
-    [RaisesException] CanvasGradient createLinearGradient([Default=Undefined] optional float x0,
-                                        [Default=Undefined] optional float y0,
-                                        [Default=Undefined] optional float x1,
-                                        [Default=Undefined] optional float y1);
-    [RaisesException] CanvasGradient createRadialGradient([Default=Undefined] optional float x0,
-                                        [Default=Undefined] optional float y0,
-                                        [Default=Undefined] optional float r0,
-                                        [Default=Undefined] optional float x1,
-                                        [Default=Undefined] optional float y1,
-                                        [Default=Undefined] optional float r1);
+    [RaisesException] CanvasGradient createLinearGradient(float x0, float y0, float x1, float y1);
+    [RaisesException] CanvasGradient createRadialGradient(float x0, float y0, float r0, float x1, float y1, float r1);
 
     attribute float lineWidth;
     [TreatNullAs=NullString] attribute DOMString lineCap;
     [TreatNullAs=NullString] attribute DOMString lineJoin;
     attribute float miterLimit;
 
     attribute float shadowOffsetX;
     attribute float shadowOffsetY;
     attribute float shadowBlur;
     [TreatNullAs=NullString] attribute DOMString shadowColor;
 
     void setLineDash(sequence<float> dash);
     sequence<float> getLineDash();
     attribute float lineDashOffset;
 
     // FIXME: These attributes should be implemented.
     // [Custom] attribute Array webkitLineDash;
     // attribute float webkitLineDashOffset;
 
-    void clearRect([Default=Undefined] optional float x,
-                   [Default=Undefined] optional float y,
-                   [Default=Undefined] optional float width,
-                   [Default=Undefined] optional float height);
-    void fillRect([Default=Undefined] optional float x,
-                  [Default=Undefined] optional float y,
-                  [Default=Undefined] optional float width,
-                  [Default=Undefined] optional float height);
+    void clearRect(float x, float y, float width, float height);
+    void fillRect(float x, float y, float width, float height);
 
     void beginPath();
 
     attribute DOMPath currentPath;
 
     // FIXME: These methods should be shared with CanvasRenderingContext2D in the CanvasPathMethods interface.
     void closePath();
-    void moveTo([Default=Undefined] optional float x,
-                [Default=Undefined] optional float y);
-    void lineTo([Default=Undefined] optional float x,
-                [Default=Undefined] optional float y);
-    void quadraticCurveTo([Default=Undefined] optional float cpx,
-                          [Default=Undefined] optional float cpy,
-                          [Default=Undefined] optional float x,
-                          [Default=Undefined] optional float y);
-    void bezierCurveTo([Default=Undefined] optional float cp1x,
-                       [Default=Undefined] optional float cp1y,
-                       [Default=Undefined] optional float cp2x,
-                       [Default=Undefined] optional float cp2y,
-                       [Default=Undefined] optional float x,
-                       [Default=Undefined] optional float y);
-    [RaisesException] void arcTo([Default=Undefined] optional float x1,
-               [Default=Undefined] optional float y1,
-               [Default=Undefined] optional float x2,
-               [Default=Undefined] optional float y2,
-               [Default=Undefined] optional float radius);
-    void rect([Default=Undefined] optional float x,
-              [Default=Undefined] optional float y,
-              [Default=Undefined] optional float width,
-              [Default=Undefined] optional float height);
-    [RaisesException] void arc([Default=Undefined] optional float x,
-             [Default=Undefined] optional float y,
-             [Default=Undefined] optional float radius,
-             [Default=Undefined] optional float startAngle,
-             [Default=Undefined] optional float endAngle,
-             [Default=Undefined] optional boolean anticlockwise);
+    void moveTo(float x, float y);
+    void lineTo(float x, float y);
+    void quadraticCurveTo(float cpx, float cpy, float x, float y);
+    void bezierCurveTo(float cp1x, float cp1y, float cp2x, float cp2y, float x, float y);
+    [RaisesException] void arcTo(float x1, float y1, float x2, float y2, float radius);
+    void rect(float x, float y, float width, float height);
+    [RaisesException] void arc(float x, float y, float radius, float startAngle, float endAngle, [Default=Undefined] optional boolean anticlockwise);
 
     void fill(optional CanvasWindingRule winding);
     void stroke();
     void clip(optional CanvasWindingRule winding);
-    boolean isPointInPath([Default=Undefined] optional float x,
-                          [Default=Undefined] optional float y,
-                          optional CanvasWindingRule winding);
-    boolean isPointInStroke([Default=Undefined] optional float x,
-                            [Default=Undefined] optional float y);
+    boolean isPointInPath(float x, float y, optional CanvasWindingRule winding);
+    boolean isPointInStroke(float x, float y);
 
     // text
     attribute DOMString font;
     attribute DOMString textAlign;
     attribute DOMString textBaseline;
 
-    TextMetrics measureText([Default=Undefined] optional DOMString text);
+    TextMetrics measureText(DOMString text);
 
     // other
 
-    void setAlpha([Default=Undefined] optional float alpha);
-    void setCompositeOperation([Default=Undefined] optional DOMString compositeOperation);
+    void setAlpha(float alpha);
+    void setCompositeOperation(DOMString compositeOperation);
 
-    void setLineWidth([Default=Undefined] optional float width);
-    void setLineCap([Default=Undefined] optional DOMString cap);
-    void setLineJoin([Default=Undefined] optional DOMString join);
-    void setMiterLimit([Default=Undefined] optional float limit);
+    void setLineWidth(float width);
+    void setLineCap(DOMString cap);
+    void setLineJoin(DOMString join);
+    void setMiterLimit(float limit);
 
     void clearShadow();
 
     void fillText(DOMString text, float x, float y, optional float maxWidth);
     void strokeText(DOMString text, float x, float y, optional float maxWidth);
 
     void setStrokeColor([StrictTypeChecking] DOMString color, optional float alpha);
     void setStrokeColor(float grayLevel, optional float alpha);
     void setStrokeColor(float r, float g, float b, float a);
     void setStrokeColor(float c, float m, float y, float k, float a);
 
     void setFillColor([StrictTypeChecking] DOMString color, optional float alpha);
     void setFillColor(float grayLevel, optional float alpha);
     void setFillColor(float r, float g, float b, float a);
     void setFillColor(float c, float m, float y, float k, float a);
 
-    void strokeRect([Default=Undefined] optional float x,
-                    [Default=Undefined] optional float y,
-                    [Default=Undefined] optional float width,
-                    [Default=Undefined] optional float height,
-                    optional float lineWidth);
+    void strokeRect(float x, float y, float width, float height, optional float lineWidth);
 
     [RaisesException] void drawImage(HTMLImageElement? image, float x, float y);
     [RaisesException] void drawImage(HTMLImageElement? image, float x, float y, float width, float height);
     [RaisesException] void drawImage(HTMLImageElement? image, float sx, float sy, float sw, float sh, float dx, float dy, float dw, float dh);
     [RaisesException] void drawImage(HTMLCanvasElement? canvas, float x, float y);
     [RaisesException] void drawImage(HTMLCanvasElement? canvas, float x, float y, float width, float height);
     [RaisesException] void drawImage(HTMLCanvasElement? canvas, float sx, float sy, float sw, float sh, float dx, float dy, float dw, float dh);
     [RaisesException] void drawImage(HTMLVideoElement? video, float x, float y);
     [RaisesException] void drawImage(HTMLVideoElement? video, float x, float y, float width, float height);
     [RaisesException] void drawImage(HTMLVideoElement? video, float sx, float sy, float sw, float sh, float dx, float dy, float dw, float dh);
@@ skipping 16 matching lines @@
 
     [RaisesException] CanvasPattern createPattern(HTMLCanvasElement? canvas, [TreatNullAs=NullString] DOMString repetitionType);
     [RaisesException] CanvasPattern createPattern(HTMLImageElement? image, [TreatNullAs=NullString] DOMString repetitionType);
     [RaisesException] ImageData createImageData(ImageData? imagedata);
     [RaisesException] ImageData createImageData(float sw, float sh);
 
     [Custom] attribute custom strokeStyle;
     [Custom] attribute custom fillStyle;
 
     // pixel manipulation
-    [RaisesException] ImageData getImageData([Default=Undefined] optional float sx, [Default=Undefined] optional float sy,
-                           [Default=Undefined] optional float sw, [Default=Undefined] optional float sh);
+    [RaisesException] ImageData getImageData(float sx, float sy, float sw, float sh);
 
-    [RaisesException] ImageData webkitGetImageDataHD([Default=Undefined] optional float sx, [Default=Undefined] optional float sy,
-                                   [Default=Undefined] optional float sw, [Default=Undefined] optional float sh);
+    [RaisesException] ImageData webkitGetImageDataHD(float sx, float sy, float sw, float sh);
 
     readonly attribute float webkitBackingStorePixelRatio;
 
     attribute boolean webkitImageSmoothingEnabled;
 
     [EnabledAtRuntime=experimentalCanvasFeatures] Canvas2DContextAttributes getContextAttributes();
 };