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When 'CreateTooltipWidget' creates 'Widget' for tooltip and
initializes it, it needs its bounds at InitParams. If it
doesn't have the bounds information, some platform widgets
get crashed and DesktopWindowTreeHostX11 keeps
|sanitized_params| to avoid this case.

This patch delivers the bounds for the tooltip widget and
adds DCHECK to find what causes the empty bounds.

Bug: 849585
Change-Id: I3de067a917e4343bab642c3a1b13434b6cfaeee0
Reviewed-on: https://chromium-review.googlesource.com/1086820Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Julie Jeongeun Kim <jkim@igalia.com>
Cr-Commit-Position: refs/heads/master@{#582426}