Generate diffing functions for generated subgroup InheritedData in ComputedStyle

This patch generates the diffing functions for StyleInheritedData which is now
a generated subgroup of ComputedStyle.

Please note: No added callsite for
ComputedStyleBase::DiffNeedsFullLayoutAndPaintInvalidation has been
added since it is already being called. We have just appended to that
JSON entry.

Diff: https://gist.github.com/nainar/5650d8c7dc6b9cc5d784c5be2409b338/revisions

BUG=710938

Review-Url: https://codereview.chromium.org/2886233004
Cr-Commit-Position: refs/heads/master@{#473015}
2 files changed