| Index: third_party/WebKit/Source/core/events/MouseEvent.idl
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| diff --git a/third_party/WebKit/Source/core/events/MouseEvent.idl b/third_party/WebKit/Source/core/events/MouseEvent.idl
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| index 0f4eab1985cb2953ebd86d4c50c9fbae9b2ac537..5d8696c489071fbcfe786142129dbb69cb50d870 100644
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| --- a/third_party/WebKit/Source/core/events/MouseEvent.idl
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| +++ b/third_party/WebKit/Source/core/events/MouseEvent.idl
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| @@ -70,6 +70,10 @@
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|      [MeasureAs=MouseEventMovementX] readonly attribute long movementX;
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|      [MeasureAs=MouseEventMovementY] readonly attribute long movementY;
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|  
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| +    // Canvas Hit Regions
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| +    // https://html.spec.whatwg.org/multipage/scripting.html#MouseEvent-partial
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| +    [RuntimeEnabled=ExperimentalCanvasFeatures] readonly attribute DOMString? region;
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| +
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|      // Non-standard
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|      [MeasureAs=MouseEventFromElement] readonly attribute Node fromElement;
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|      [MeasureAs=MouseEventToElement] readonly attribute Node toElement;
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| 
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