Add versions of stroke, fill, and clip that take a Path parameter.

Source/core/html/canvas/CanvasRenderingContext2D.idl

Index: Source/core/html/canvas/CanvasRenderingContext2D.idl
diff --git a/Source/core/html/canvas/CanvasRenderingContext2D.idl b/Source/core/html/canvas/CanvasRenderingContext2D.idl
index d99a6a07c70e63980e4b6f616949681725ca2627..223ea6f57cdbf673d544a2261e0d8d2eac4db534 100644
--- a/Source/core/html/canvas/CanvasRenderingContext2D.idl
+++ b/Source/core/html/canvas/CanvasRenderingContext2D.idl
@@ -76,9 +76,18 @@ interface CanvasRenderingContext2D : CanvasRenderingContext {
     [RaisesException] void arc(float x, float y, float radius, float startAngle, float endAngle, [Default=Undefined] optional boolean anticlockwise);
     [RaisesException] void ellipse(float x, float y, float radiusX, float radiusY, float rotation, float startAngle, float endAngle, [Default=Undefined] optional boolean anticlockwise);
 
-    void fill(optional CanvasWindingRule winding);
+    // FIXME: Simplify these using optional CanvasWindingRule once crbug.com/339000 gets fixed.
+    void fill();
+    [RuntimeEnabled=ExperimentalCanvasFeatures] void fill(Path path);
+    void fill(CanvasWindingRule winding);
+    [RuntimeEnabled=ExperimentalCanvasFeatures] void fill(Path path, CanvasWindingRule winding);
     void stroke();
-    void clip(optional CanvasWindingRule winding);
+    [RuntimeEnabled=ExperimentalCanvasFeatures] void stroke(Path path);
+    // FIXME: Simplify these using optional CanvasWindingRule once crbug.com/339000 gets fixed.
+    void clip();
+    [RuntimeEnabled=ExperimentalCanvasFeatures] void clip(Path path);
+    void clip(CanvasWindingRule winding);
+    [RuntimeEnabled=ExperimentalCanvasFeatures] void clip(Path path, CanvasWindingRule winding);
     boolean isPointInPath(float x, float y, optional CanvasWindingRule winding);
     boolean isPointInStroke(float x, float y);