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This is a reland of 9a224d53

Original change's description:
> Miscellaneous holding space fixes.
>
> Fix pin toggle bounds in HoldingSpaceItemScreenshotView:
> The bounds of the pin toggle button were being stretched to match the
> full height of its parent container.
>
> Fix context menu bounds:
> Context menu should be below the associated view (when space allows).
>
> Fix long press gesture:
> When long pressing, the pressed view should become the selection just
> prior to showing the context menu.
>
> Fix crash in HoldingSpaceTrayBubble:
> If closing bubble due to ESC, bubble widget should only be closed if it
> exists and hasn't already been marked closed.
>
> Fix drag behavior:
> The holding space bubble should be closed during drag events.
>
> Bug: 1131262, 1131267, 1129981
> Change-Id: I5a1f0536ae6badeed841e0a6106e9c423cbf3781
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2436671
> Reviewed-by: Ahmed Mehfooz <amehfooz@chromium.org>
> Commit-Queue: David Black <dmblack@google.com>
> Cr-Commit-Position: refs/heads/master@{#812064}

Bug: 1131262
Bug: 1131267
Bug: 1129981
Change-Id: I2e7438ac8b46c2bedf0896393e11a52cbf9f26ec
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2441251
Commit-Queue: David Black <dmblack@google.com>
Reviewed-by: Ahmed Mehfooz <amehfooz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812535}