zijiehe 2769ec62c0 Add WriteIsolatedOutput() functions
WriteIsolatedOutput() functions write large content into swarming isolated
output folder, which are useful to log large test data for debugging purpose.

BUG=webrtc:6732

TBR=holmer@webrtc.org

Review-Url: https://codereview.webrtc.org/2558693002
Cr-Commit-Position: refs/heads/master@{#15616}
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