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On Linux, this is a blocking call that makes a round trip to the X
server.  On my machine (with a local X server), this call usually takes
over 1ms (and much longer for a remote server!).

This call gets made on every mouse motion event in the web contents,
and in many other cases like tab dragging and DND.  The issue is that
value_or() was added in [1] which always calls GetCursorLocation(),
even when the cached cursor location is available.

[1] https://chromium-review.googlesource.com/c/chromium/src/+/2104428

BUG=None
R=sky

Change-Id: If2d0fd4bfb62927e4a408c4f3d5ccf72da8a0b81
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2128941
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Auto-Submit: Thomas Anderson <thomasanderson@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#754761}