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Both the explicit and automatic lazyload should be disabled when the
document is loaded for a background tab or prerendered. This is because
interesection observer never fires for backgrounded/prerendered
documents, until the background tab comes to foreground.

Bug: 1000814
Change-Id: I3f6efe434d90cb3d0dd9d9f8df3afd2f89e8c05b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1787568
Commit-Queue: rajendrant <rajendrant@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Ryan Sturm <ryansturm@chromium.org>
Cr-Commit-Position: refs/heads/master@{#696613}