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LogonUI uses fixed buffer size to pass the json object to rundll32. To fix the issue, first write/read the buffer size to/from the pipe.

Bug: 902911 https://bugs.chromium.org/p/chromium/issues/detail?id=902911
Change-Id: Ibfc23a098c53c4b6c58a979ee38fb46dc38d55bf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1825909
Commit-Queue: Emre Kanlikilicer <emreknlk@google.com>
Reviewed-by: Tien Mai <tienmai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#700446}