Bazel client, Windows: implement ConvertPath 
Bazel client, Windows: implement ConvertPath 

See https://github.com/bazelbuild/bazel/issues/2107

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Change-Id: I7a325521f52bc4027b55df5451f549ac737242f8
Reviewed-on: https://cr.bazel.build/8953
PiperOrigin-RevId: 147715340
MOS_MIGRATED_REVID=147715340

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