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A captured tab going into fullscreen is treated differently: instead
of taking up the entire screen, it only fills the browser's contents
container. This is to allow tabs to enter fullscreen while being
streamed without disrupting the user. For example, fullscreening a
video during capture will cause the video to fill the tab contents
rather than the whole screen.

Thumbnail capture uses this same infrastructure but shouldn't affect
any user-visible behavior. This CL prevents thumbnails from being
captured on visible tabs.

Ideally we'd be able to put a capture hold on a WebContents without
affecting fullscreen behavior, but implementing that is a larger
investment. Fixing this bug is a high priority.

Bug: 1112607
Change-Id: I58cc53b2d881bf65cf2a9cb70d1a5d1592d02ad2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2354728
Commit-Queue: Collin Baker <collinbaker@chromium.org>
Reviewed-by: Dana Fried <dfried@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800795}