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This clears animation state maps maintained in IAC, on navigaion.
The navigaiton signal is recieved from LTH and the entries without
driver/recordings are cleared on activation. A new LTHI func is
introduced ::DidNavigate, which takes care of clearing both animation
and decode cache.

BUG=789715

Change-Id: I8c6b37a6c2783ff727931e9812ff41c4321ab855
Reviewed-on: https://chromium-review.googlesource.com/919265
Commit-Queue: Sohan Jyoti Ghosh <sohan.jyoti@huawei.com>
Reviewed-by: Khushal <khushalsagar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542613}