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This CL makes normal load deferring (i.e. pausing, frozen background etc)
and bfcache load deferring different.
This is to avoid bfcache specific calls all the time, such as eviction.

Also this allows to set memory limit / time limit for network requests
only for bfcache, without changing normal deferring behavior.

Bug: 1137682
Change-Id: I6b9f082ad0c4ebb959730106381673e1aae8bb61
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2549023
Commit-Queue: Yuzu Saijo <yuzus@chromium.org>
Reviewed-by: Yutaka Hirano <yhirano@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#830525}