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This change introduces Adaptive suggestions count, where the number
of offered suggestions is driven by the available screen space.

The mechanism needs to decide whether a suggestion is eligible ahead
of Layout call, and is therefore unable to reliably identify the
height of a suggestion, therefore we use minimum suggestion height
instead.

Bug: 1050813
Change-Id: I1fc440f6e86fc0ca764b79e8c835be174bf31da6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2071139
Commit-Queue: Ender <ender@google.com>
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Reviewed-by: Patrick Noland <pnoland@chromium.org>
Cr-Commit-Position: refs/heads/master@{#748481}