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

LayoutTests/fast/canvas/canvas-path-context-fill-expected.txt

Index: LayoutTests/fast/canvas/canvas-path-context-fill-expected.txt
diff --git a/LayoutTests/fast/canvas/canvas-path-context-fill-expected.txt b/LayoutTests/fast/canvas/canvas-path-context-fill-expected.txt
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+++ b/LayoutTests/fast/canvas/canvas-path-context-fill-expected.txt
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+Series of tests to ensure fill() works with path and winding rule parameters.
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+Testing fill()
+PASS pixelDataAtPoint()[0] is within 5 of 0
+PASS pixelDataAtPoint()[1] is within 5 of 255
+PASS pixelDataAtPoint()[2] is within 5 of 0
+PASS pixelDataAtPoint()[3] is within 5 of 255
+
+Testing fill(path)
+PASS pixelDataAtPoint()[0] is within 5 of 0
+PASS pixelDataAtPoint()[1] is within 5 of 255
+PASS pixelDataAtPoint()[2] is within 5 of 0
+PASS pixelDataAtPoint()[3] is within 5 of 255
+
+Testing fill("nonzero")
+PASS pixelDataAtPoint()[0] is within 5 of 0
+PASS pixelDataAtPoint()[1] is within 5 of 255
+PASS pixelDataAtPoint()[2] is within 5 of 0
+PASS pixelDataAtPoint()[3] is within 5 of 255
+
+Testing fill(path, "nonzero")
+PASS pixelDataAtPoint()[0] is within 5 of 0
+PASS pixelDataAtPoint()[1] is within 5 of 255
+PASS pixelDataAtPoint()[2] is within 5 of 0
+PASS pixelDataAtPoint()[3] is within 5 of 255
+
+Testing fill("evenodd")
+PASS pixelDataAtPoint()[0] is within 5 of 255
+PASS pixelDataAtPoint()[1] is within 5 of 0
+PASS pixelDataAtPoint()[2] is within 5 of 0
+PASS pixelDataAtPoint()[3] is within 5 of 255
+
+Testing fill(path, "evenodd")
+PASS pixelDataAtPoint()[0] is within 5 of 255
+PASS pixelDataAtPoint()[1] is within 5 of 0
+PASS pixelDataAtPoint()[2] is within 5 of 0
+PASS pixelDataAtPoint()[3] is within 5 of 255
+
+PASS successfullyParsed is true
+
+TEST COMPLETE
+