https://chromium.googlesource.com/chromium/blink/+/899a7a4375e3d124a3e740aa368ef733f3ebfa3e
Consider merging the above change. hecking if frame is complete and access duration doesn't need a decode The goal of this change is to minimize image decoding on the main thread. This change is to avoid image decoding for these two operations: 1. frameIsCompleteAtIndex 2. frameDurationAtIndex These two operations are moved to ImageDecoder interface and are now const to prevent future regression. We are now able to check if a frame is complete by parsing the entire GIF file without decoding. This also provides information like frame duration such that controller the animation doesn't require any decoding. This change is critical to moving animated image decoding off the main thread.
*** This bug has been marked as a duplicate of bug 116041 ***