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Hides tooltips when windows are hidden or minimized on Windows.

Previously, when a browser window was minimized by the OS, tooltips
would stay open on top of other windows because they did not receive an
event that the mouse left the window. This was due to a race condition
between the minimize message and the WM_MOUSELEAVE message. Since Aura
first receives the minimize message and makes the Aura window not
"visible", the subsequent mouse exit event was thus rejected by the Aura
window. Consequently, tooltips would stick around indefinitely until the
window was restored and interacted with.

To fix this, we make the tooltip controller respond to the
WM_WINDOWPOSCHANGED message (which is also sent to us when the window is
minimizing) by explicitly hiding the tooltip.

Bug: 724538
Change-Id: I9e8a60e6de943230708b12f3a05b8ee03c27e54a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2241631Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Brian Liu Xu <brx@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#777994}