Anny Gakhokidze 5986a2de44 Bug 1546759 - Change nsSHistory::WalkHistoryEntries to walk browsing context tree instead of doc shell tree, r=peterv,nika
WalkHistoryEntries function gets called by nsSHistory::CloneAndReplaceChild
and nsSHistory::SetChildHistoryEntry recursively, so those have to be moved
into the parent process. This eliminates many sync IPC calls.

To facilitate transition to a new session history design,
we are mirroring mOSHE and mLSHE SH entries from docshell to browsing context.
Whenever we update those entries in docshell, we will also update those in BC,
and vice versa.

Differential Revision: https://phabricator.services.mozilla.com/D56201

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extra : moz-landing-system : lando
2020-03-10 14:28:22 +00:00
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