Add a sample Windows ETW CSwitch trace.
Add a sample Windows ETW CSwitch trace.

Add file trace-viewer/test_data/windows_etw_cswitch.json, which contains ETW threads and processes scheduling events.

Depends on https://codereview.appspot.com/105550045/

(3/3)

BUG=
R=etienneb@chromium.org

Review URL: https://codereview.appspot.com/109490043
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