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The very fact that AppCache is supported introduces a delay to preloaded
requests. We could use the `manifest` attribute to detect pages where
AppCache is used and only delay requests there.
This CL adds a counter for pages where this heuristic will fail (and
likely result in a spurious download). Assuming the counter is
relatively low, we'd be able to go ahead with implementing the
heuristic.

Bug: 788757
Change-Id: If5ca0c8682fa677677df38f59946b3198588d4a3
Reviewed-on: https://chromium-review.googlesource.com/c/1442051
Commit-Queue: Yoav Weiss <yoavweiss@chromium.org>
Reviewed-by: Mike West <mkwst@chromium.org>
Cr-Commit-Position: refs/heads/master@{#626968}