[LNT] add json export to graph page

[Daniel Dunbar]

Flatten is misspelled in the first comment, but otherwise LGTM.

 - Daniel


On Wed, Mar 19, 2014 at 11:33 AM, Chris Matthews
<chris.matthews at apple.com>wrote:

> Provide a simple export feature for graphs, but not a real json API.  Add
> a json flag to the graph page.  When passed, dump the graph data and
> metadata in json format.
>
>
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