Jing Xu 1636b2b452 Flush data cache during unmount device for GCE-PD in Windows ...

This PR fixes the issue mentioned in #83590 for GCE-PD. It uses
WriteVolumeCache API to writes the file system cache to disk during
UnmountDevice in Windows. Linux does not need to explicitly flush cache
because unmount will automatically sync the disk which also flush the
cache.

Change-Id: Ife2745c92b8c0446e79a52e9f9ec7851d2f6b90d

2019-10-16 10:12:35 -07:00

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