Add some ImageData constructor tests.

[Ms2ger]

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Firefox (nightly channel)

Testing web-platform-tests at revision 85f883c
Using browser at version BuildID 20170312110221; SourceStamp 3154da520af568d4da3de62bc26fbf97a1317f51
Starting 10 test iterations
All results were stable

All results

4 tests ran

/2dcontext/pixel-manipulation/2d.imageData.object.ctor.array.bounds.html

Subtest	Results	Messages
	OK
ImageData has a usable constructor	PASS

/2dcontext/pixel-manipulation/2d.imageData.object.ctor.array.html

Subtest	Results	Messages
	OK
ImageData has a usable constructor	PASS

/2dcontext/pixel-manipulation/2d.imageData.object.ctor.size.bounds.html

Subtest	Results	Messages
	OK
ImageData has a usable constructor	PASS

/2dcontext/pixel-manipulation/2d.imageData.object.ctor.size.html

Subtest	Results	Messages
	OK
ImageData has a usable constructor	PASS

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View the complete job log.

Chrome (unstable channel)

Testing web-platform-tests at revision 85f883c
Using browser at version 58.0.3029.14 dev
Starting 10 test iterations
All results were stable

All results

4 tests ran

/2dcontext/pixel-manipulation/2d.imageData.object.ctor.array.bounds.html

Subtest	Results	Messages
	OK
ImageData has a usable constructor	FAIL	assert_throws: function "function () { new ImageData(new Uint8ClampedArray(0), 1); }" threw object "IndexSizeError: Failed to construct 'ImageData': The input data has zero elements." that is not a DOMException INVALID_STATE_ERR: property "code" is equal to 1, expected 11

/2dcontext/pixel-manipulation/2d.imageData.object.ctor.array.html

Subtest	Results	Messages
	OK
ImageData has a usable constructor	PASS

/2dcontext/pixel-manipulation/2d.imageData.object.ctor.size.bounds.html

Subtest	Results	Messages
	OK
ImageData has a usable constructor	PASS

/2dcontext/pixel-manipulation/2d.imageData.object.ctor.size.html

Subtest	Results	Messages
	OK
ImageData has a usable constructor	PASS

[nox]

LGTM.