[missing] Expose Window.createImageBitmap

[vsmenon]

This popped up in the last Blink IDL roll with 12 overloads. I hid it for now. We need to determine what names to expose the different variants under.

[vsmenon]

Here are the entries in Window.idl:

    // Images
    [EnabledAtRuntime=experimentalCanvasFeatures, RaisesException] void createImageBitmap(HTMLImageElement image, ImageBitmapCall
back callback);
    [EnabledAtRuntime=experimentalCanvasFeatures, RaisesException] void createImageBitmap(HTMLImageElement image, ImageBitmapCall
back callback, long sx, long sy, long sw, long sh);
    [EnabledAtRuntime=experimentalCanvasFeatures, RaisesException] void createImageBitmap(HTMLVideoElement video, ImageBitmapCall
back callback);
    [EnabledAtRuntime=experimentalCanvasFeatures, RaisesException] void createImageBitmap(HTMLVideoElement video, ImageBitmapCall
back callback, long sx, long sy, long sw, long sh);
    [EnabledAtRuntime=experimentalCanvasFeatures, RaisesException] void createImageBitmap(CanvasRenderingContext2D context, Image
BitmapCallback callback);
    [EnabledAtRuntime=experimentalCanvasFeatures, RaisesException] void createImageBitmap(CanvasRenderingContext2D context, Image
BitmapCallback callback, long sx, long sy, long sw, long sh);
    [EnabledAtRuntime=experimentalCanvasFeatures, RaisesException] void createImageBitmap(HTMLCanvasElement canvas, ImageBitmapCa
llback callback);
    [EnabledAtRuntime=experimentalCanvasFeatures, RaisesException] void createImageBitmap(HTMLCanvasElement canvas, ImageBitmapCa
llback callback, long sx, long sy, long sw, long sh);
    [EnabledAtRuntime=experimentalCanvasFeatures, RaisesException] void createImageBitmap(ImageData data, ImageBitmapCallback cal
lback);
    [EnabledAtRuntime=experimentalCanvasFeatures, RaisesException] void createImageBitmap(ImageData data, ImageBitmapCallback cal
lback, long sx, long sy, long sw, long sh);
    [EnabledAtRuntime=experimentalCanvasFeatures, RaisesException] void createImageBitmap(ImageBitmap bitmap, ImageBitmapCallback
 callback);
    [EnabledAtRuntime=experimentalCanvasFeatures, RaisesException] void createImageBitmap(ImageBitmap bitmap, ImageBitmapCallback
 callback, long sx, long sy, long sw, long sh);

[efortuna]

Added this to the Later milestone.

[kevmoo]

Removed Area-HTML label.
Added Area-Library, Library-Html labels.

[kasperl]

Removed this from the Later milestone.
Added Oldschool-Milestone-Later label.

[kasperl]

Removed Oldschool-Milestone-Later label.

[alan-knight]

Removed Priority-Unassigned label.
Added Priority-Medium label.
Changed the title to: "[missing] Expose Window.createImageBitmap".