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Currently, it is only defined on NavigationRequests. Defining it on
the handles too will allow for easy determination of when a navigation
has passed through ReadyToCommitNavigation(), i.e. via HasCommitted() ||
IsWaitingToCommit(). Note that some navigations can pass through
ReadyToCommitNavigation() without eventually committing -- e.g. due to a
doc.write. Adding this call will simplify handling of these edge cases.

Bug: 1101584
Change-Id: I7c272ef2768a901b8988bfe8e28ae1a0c3ef2ca9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2536389Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Commit-Queue: Alex Turner <alexmt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827933}