Rename apply() in CSSInterpolationType subclasses

This patch renames apply() to applyStandardPropertyValue() in all
CSSInterpolationType subclasses and adds an implementation of
apply() to CSSInterpolationType that delegates directly though.
Additionally the the InterpolationEnvironment& parameter has been
replaced with the inner StyleResolverState& as nothing else on the
environment was needed by the affected classes.

This is in preparation to support application of animated values for
registered custom properties.

There are no behavioural changes made by this patch.

BUG=671904

Review-Url: https://codereview.chromium.org/2578043002
Cr-Commit-Position: refs/heads/master@{#440307}
52 files changed