Repeat image inlined at low resolution when local_storage_cache is enabled.

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From Wesley Ripley:

Hello,
I am using google mod_pagespeed with a very image heavy webpage. As a result I 
would like to have google pagespeed to do as much as possible to help the 
images load faster. One of the things that was helping was inlining the images 
but I have run into a problem. It is possible (and sometimes likely) for an 
image to be displayed on one page twice with different dimensions and I have 
found that inlining images does not work in this case. The first time it is 
used the image gets resized and inlined correctly but for every other 
occurrence it uses the same data string to inline the image so if the first one 
was tiny, the larger ones look very blurry. 

Is there any way to make pagespeed handle this correctly (besides resizing the 
images on my own and making them have different urls)? Also if you have any 
suggestions about the best way to handle many pictures per page that would be 
great.

Thank You

Original issue reported on code.google.com by sligocki@google.com on 3 Sep 2013 at 1:38