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Retrieving this information requires IPC to the remote process, which
is blocking and thus must not be done on the UI thread.

But the ModuleEventSinkImpl instance must still live on the UI thread,
because thats where the RenderProcessHost instance lives. The
RenderProcessHost must be accessed to get the handle to the remote
process inside the ModuleEventSinkImpl::Create() factory function.

To make the process handle available from the background task, it is
now duplicated and passed to the task via the PostTaskWithTraits()
call.

Bug: 832286
Change-Id: I3948a585f3d7645d706b0e8977cdf3182f212306
Reviewed-on: https://chromium-review.googlesource.com/1058339Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Patrick Monette <pmonette@chromium.org>
Cr-Commit-Position: refs/heads/master@{#558758}