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CanvasImageDecoder is instantiated with a callback into a Dart closure. That closure was holding references to the ImageDecoder and the returned Image. The circular reference between the ImageDecoder and the callback prevented the objects from being GCed, resulting in leakage of the image buffer. CanvasImageDecoder will now destroy the callback after it is invoked, thus releasing its handle to the Dart closure.
Sky Engine
This directory contains the bulk of the C++ code backing the
dart:ui module.
It is based on Blink, Chromium's rendering engine, which itself is descended from WebKit, which is descended from KHTML.