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ThumbnailTabHelper now captures the entire contents of a web page
(within the bounds of the window) as the raw thumbnail instead of an
image specifically cropped for tab hover cards.

The image is scaled down to a size that can be used by both the touch-
only tabstrip and hover cards, even when it must be cropped. Observers
can now specify a size hint for uncompressed images; so that when the
image is received by the observer it is pre-cropped appropriately.

We use this new system to ensure that tab hover cards are still getting
appropriately-sized thumbnails, but the touch-only tabstrip gets the
entire compressed image of the webpage, at approximately the original
aspect ratio.

Bug: 1013646
Change-Id: If63dc7e13f8ddef09e991fcb20f5bef8cacad302
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1887734
Commit-Queue: Dana Fried <dfried@chromium.org>
Reviewed-by: Collin Baker <collinbaker@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710974}