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Previously, support for the "loading" attribute to control lazy iframe
loading was only used in conjunction with automatic lazy loading. This
CL separates those two concepts, allowing for "loading" attribute
support to be enabled for iframes without automatically lazily loading
iframes that have no "loading" attribute set.

Bug: 937980
Change-Id: I0bf8f0e4d073fee3a3530b654a7834d1eb70cee1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1633790Reviewed-by: rajendrant <rajendrant@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Scott Little <sclittle@chromium.org>
Cr-Commit-Position: refs/heads/master@{#664608}