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

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

Index: LayoutTests/fast/canvas/canvas-path-context-clip-expected.txt
diff --git a/LayoutTests/fast/canvas/canvas-path-context-clip-expected.txt b/LayoutTests/fast/canvas/canvas-path-context-clip-expected.txt
new file mode 100644
index 0000000000000000000000000000000000000000..48864a4d80ba0ac49a5073f23628a475f4e920f5
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+++ b/LayoutTests/fast/canvas/canvas-path-context-clip-expected.txt
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+Series of tests to ensure clip() works with path and winding rule parameters.
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+Testing clip()
+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 clip(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 clip("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 clip(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 clip("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 clip(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 ctx.clip(null) threw exception TypeError: Failed to execute 'clip' on 'CanvasRenderingContext2D': parameter 1 ('null') is not a valid enum value..
+PASS ctx.clip(null, null) threw exception TypeError: Failed to execute 'clip' on 'CanvasRenderingContext2D': No function was found that matched the signature provided..
+PASS successfullyParsed is true
+
+TEST COMPLETE
+