OOPIF: Set timer for per-frame UpdateState.
We continue to use a per-page timer on RenderView, but it keeps track of
which frames have pending state updates to send. In most cases, only a
single frame will need to send an update. If there are multiple such
frames, each one will send an UpdateState IPC when the timer fires.
BUG=545219
TEST=Scroll and form state restored in OOPIFs after close
(once OOPIF session restore is fixed)
Review URL: https://codereview.chromium.org/1449353002
Cr-Commit-Position: refs/heads/master@{#361821}
5 files changed
