Implement basic parts of hit regions on canvas2d.

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 2b28f1769210239f359d73ad847fb62f50b7a85a..2262f6c8ea1aeb72c1ecb8a17ff638bb5c211f4b 100644
--- a/Source/core/html/canvas/CanvasRenderingContext2D.idl
+++ b/Source/core/html/canvas/CanvasRenderingContext2D.idl
@@ -133,6 +133,15 @@ enum CanvasFillRule { "nonzero", "evenodd" };
     [RuntimeEnabled=ExperimentalCanvasFeatures, RaisesException] void drawImage(ImageBitmap imageBitmap, unrestricted float x, unrestricted float y, unrestricted float width, unrestricted float height);
     [RuntimeEnabled=ExperimentalCanvasFeatures, RaisesException] void drawImage(ImageBitmap imageBitmap, unrestricted float sx, unrestricted float sy, unrestricted float sw, unrestricted float sh, unrestricted float dx, unrestricted float dy, unrestricted float dw, unrestricted float dh);
 
+    // hit regions
+    // FIXME: Blink does not currently support WebIDL dictionary definitions.
+    // See http://crbug.com/321462
+    [RuntimeEnabled=ExperimentalCanvasFeatures, RaisesException] void addHitRegion(optional Dictionary options);
+    [RuntimeEnabled=ExperimentalCanvasFeatures] void removeHitRegion(DOMString id);
+    [RuntimeEnabled=ExperimentalCanvasFeatures] void clearHitRegions();
+    // This attribute is supplied only for the purpose of testing.
+    [RuntimeEnabled=ExperimentalCanvasFeatures] readonly attribute unsigned short hitRegionsCount;

[Rik, 2014/06/02 22:57:40]

will this be removed later then?

[fs, 2014/06/03 11:47:01]

Move to Internals?

[zino, 2014/06/06 06:35:16]

Done.

+
     // pixel manipulation
     ImageData createImageData(ImageData imagedata);
     [RaisesException] ImageData createImageData(float sw, float sh);