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This CL import/export RenderPass data from/to DictionaryValue.

Most fields are iterated through, so they are readable/modifiable in
the JSON file. However, filters are saved as a encoded string. It
will be implemented in the future if needs arise.

The issue not to iterate through filters data is that whenever we
update the data structure, it invalidates previously recorded data.

A followup CL will add recorded render pass list JSON files from
top sites, and use them for renderer_perftests.

R=sunnyps@chromium.org

Change-Id: Ieff731ca5558bc5647ff1d8d1f0e06d103dbaab0
Bug: 1026447
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1889114
Commit-Queue: Zhenyao Mo <zmo@chromium.org>
Reviewed-by: ccameron <ccameron@chromium.org>
Reviewed-by: Sunny Sachanandani <sunnyps@chromium.org>
Cr-Commit-Position: refs/heads/master@{#723654}