tree e518563699d24c605561e1070b1b03031bd04f01
parent e0255eded6d4fb960323b8aa66065783ea9ae5e1
author nainar <nainar@chromium.org> 1494822495 -0700
committer Commit bot <commit-bot@chromium.org> 1494822495 +0000

Refactor code generation to allow us to diff generic expressions and not just fields

This patch refactors the diffing generator code to allow us to diff
field getters and other expressions instead of just fields themselves in
the future.

It does so by creating a tree of groups to diff (DiffGroups)
that store the subgroups to diff as well as the expressions to diff.
For now the expressions are just the field accessors. In the future,
they will contain expressions like BorderLeftWidth() - a public getter
for border-left-width, and HasTransform() - which is not a field or
its getter.

Diff: https://gist.github.com/d14529581f729e810842254cbf7dc1f5/revisions

BUG=710938

Review-Url: https://codereview.chromium.org/2879563002
Cr-Commit-Position: refs/heads/master@{#471666}