Support nested groups in diff functions in ComputedStyle.

This patch changes how diff functions are generated so that they work
even when there are nested groups.

This patch does not change existing generated code.

Bug: 628043
Change-Id: Ice96c072d135cf44ed4a9faf2339f5b6f70ff2ed
Reviewed-on: https://chromium-review.googlesource.com/535376
Commit-Queue: Darren Shen <shend@chromium.org>
Reviewed-by: Naina Raisinghani <nainar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#479349}
2 files changed