Deferred image decoding to handle broken GIFs

Deferred image decoding to handle broken GIFs

With some broken animated images the decoder could report a smaller
frame number as more data is received. We should handle this edge case
by early out. The animation sequence might not be correct. That's okay
because it's a broken file.

BUG=352421
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=169698

[Alpha Left Google, 2014-03-20 20:47:12]

ping. This needs to merge to m34.

[Stephen White, 2014-03-20 20:51:56]

LGTM

[Alpha Left Google, 2014-03-20 20:52:52]

The CQ bit was checked by hclam@chromium.org

[commit-bot: I haz the power, 2014-03-20 20:52:56]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/hclam@chromium.org/205333004/1

[commit-bot: I haz the power, 2014-03-20 21:56:17]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/hclam@chromium.org/205333004/1

[commit-bot: I haz the power, 2014-03-20 22:00:04]

Change committed as 169698