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After showing the multipaste menu, the first menu item should be
selected. Now the item is selected in the synchronous way. However,
the synthesized mouse event may cancel the selection. It can happen
when launching the multipaste menu from a context menu. To solve
this problem, this CL selects the item asynchronously after the menu
shows. In addition, it also adapts the test code to this change.

Bug: 1164604
Change-Id: I59e141462c2968e0a4271b33f5a4107ee01f6298
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2619079Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: David Black <dmblack@google.com>
Commit-Queue: Andrew Xu <andrewxu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#842244}