c691a3beb9
Add ParentProcessDocumentChannel object. This object is a DocumentChannel that will start a channel load from the parent process via a DocumentChannel. The aim of this task is two-fold. 1- Be consistent on how we handle redirects before continuing the load on the final channel. 2- Prepare to initiate a process switch when needed without having to go via an intermediary content process, saving a process switch. This task will be done in a follow-up task. The behaviour of the ParentProcessDocumentChannel is similar in logic to the DocumentChannelChild/DocumentChannelParent pair. The ParentProcessDocumentChannel sets up a DocumentLoadListener, have it handle the redirects and upon completion continue the load on the final channel. Differential Revision: https://phabricator.services.mozilla.com/D70009
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