Implement color management for ImageData

third_party/WebKit/Source/core/html/Float32ImageData.idl

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-// https://html.spec.whatwg.org/#dom-imagedata
+// https://github.com/junov/CanvasColorSpace/blob/master/CanvasColorSpaceProposal.md#imagedata
 
 [
     Constructor(unsigned long sw, unsigned long sh),
-    Constructor(Uint8ClampedArray data, unsigned long sw, optional unsigned long sh),
+    Constructor(unsigned long sw, unsigned long sh, ImageDataColorSpace colorSpace),
+    Constructor(Float32Array data, unsigned long sw),
+    Constructor(Float32Array data, unsigned long sw, unsigned long sh),
+    Constructor(Float32Array data, unsigned long sw, unsigned long sh, ImageDataColorSpace colorSpace),
+
     Exposed=(Window,Worker),
     RaisesException=Constructor,
-] interface ImageData {
+    RuntimeEnabled=ExperimentalCanvasFeatures,
+] interface Float32ImageData {
     readonly attribute unsigned long width;
     readonly attribute unsigned long height;
-    // TODO(foolip): Expose data.
-    // readonly attribute Uint8ClampedArray data;
+    readonly attribute Float32Array data;
+    readonly attribute ImageDataColorSpace colorSpace;
 };