[webkit] [9] Review request for 8153148: Defer image decoding until WebCore requests ImageFrame

[Arunprasad Rajkumar]

Hi Kevin, Peter, Alexander,

Please review the below patch.
JIRA: https://bugs.openjdk.java.net/browse/JDK-8153148
Webrev: http://cr.openjdk.java.net/~arajkumar/8153148/webrev.00/

Issue: Currently we are decoding the images as soon as it is downloaded. 
Though it helps rendering, but it hurts memory badly. Also causes OOM 
with pages which has quite a few images.

Fix: Like other WebKit ports{GTK,EFL}, defers the image decoding until 
painting.

Regards,
Arun