(Emscripten) WebP lossy decoder broken

[GoogleCodeExporter]

What steps will reproduce the problem?
1. I built on Emscripten libwebp and wrapper 
(https://github.com/acterhd/libwebp.js). 
2. Tested on this webpage (https://github.com/acterhd/webpdec)

What is the expected output? What do you see instead?
Correct lossy WebP result.

What version of the product are you using? On what operating system?
Latest (GIT version).

Please provide any additional information below.
I don't know what is wrong. 

Original issue reported on code.google.com by acte...@gmail.com on 10 Sep 2015 at 8:06

[GoogleCodeExporter]

Just a guess, but try defining WEBP_FORCE_ALIGNED; this define is the 
progression from earlier experiments:

https://chromium-review.googlesource.com/#/c/43081/

Original comment by jz...@google.com on 11 Sep 2015 at 5:50