Forward declare CSSAnimationUpdate in StyleResolverState

This significantly speeds up incremental compiles when working on
animations, dropping the steps required from ~700 to ~50. Note
that the various un-inlined functions were moved as destructing
OwnPtr and PassOwnPtr objects requires the compiler to have the
pointed-to object's destructor available.

BUG=

Review URL: https://codereview.chromium.org/132693005

git-svn-id: svn://svn.chromium.org/blink/trunk@165440 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Allow inline event handlers in imported documents.

This change allows inline script running, if the document
has "context" frame, that is the frame of the master document.

TEST=import-events-inline.html
BUG=334773

Review URL: https://codereview.chromium.org/130123003

git-svn-id: svn://svn.chromium.org/blink/trunk@165441 bbb929c8-8fbe-4397-9dbb-9b2b20218538