Add ImageData-related API to OffscreenCanvasRenderingContext2D

third_party/WebKit/Source/modules/offscreencanvas2d/OffscreenCanvasRenderingContext2D.idl

Index: third_party/WebKit/Source/modules/offscreencanvas2d/OffscreenCanvasRenderingContext2D.idl
diff --git a/third_party/WebKit/Source/modules/offscreencanvas2d/OffscreenCanvasRenderingContext2D.idl b/third_party/WebKit/Source/modules/offscreencanvas2d/OffscreenCanvasRenderingContext2D.idl
index 96d43dc151a07a0eeaff8151732a19e5e17bced5..47a603c2db95b53c0e5382455fbd2777b52c8e90 100644
--- a/third_party/WebKit/Source/modules/offscreencanvas2d/OffscreenCanvasRenderingContext2D.idl
+++ b/third_party/WebKit/Source/modules/offscreencanvas2d/OffscreenCanvasRenderingContext2D.idl
@@ -63,6 +63,13 @@
     attribute unrestricted double shadowOffsetY;
     attribute unrestricted double shadowBlur;
     attribute DOMString shadowColor;
+
+    // pixel manipulation
+    [RaisesException] ImageData createImageData(ImageData imagedata);
+    [RaisesException] ImageData createImageData(double sw, double sh);
+    [RaisesException] ImageData getImageData(double sx, double sy, double sw, double sh);
+    [RaisesException] void putImageData(ImageData imagedata, double dx, double dy);
+    [RaisesException] void putImageData(ImageData imagedata, double dx, double dy, double dirtyX, double dirtyY, double dirtyWidth, double dirtyHeight);
 };
 
 OffscreenCanvasRenderingContext2D implements CanvasPathMethods;