Bug 863958 - Don't call SetSize from the ICO decoder if we already have the size. r=seth

--HG--
extra : rebase_source : 924fbe8460992b919d3d7072d162f23eaef30e2f
Bug 863958 - Crashtest. r=seth

--HG--
extra : rebase_source : 5f1fa4cd01aba2b1a9b07a8120711b58d36f5ddf
Bug 863975 - Handle the situation that we're left mid-frame when decoding a multi-frame image. r=seth

--HG--
extra : rebase_source : e485eb48a615f3e35e4e5592d0f37604402142f8
Bug 863975 - Crashtest. r=seth

--HG--
extra : rebase_source : 2816b2f65b49091914c643357275c169911a4b2f