codediff.js
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Add a way to show some (but not all) context lines
e.g. when I run webdiff https://github.com/danvk/dygraphs/pull/534/files, I see this:

it would be nice if I could see, say, 50 of those lines of context rather than all 2011 of them.
Here's what the UI looks like in Gerrit:
