tree baad976517d22ffe344ee9b3ae608729d5cd5c39
parent 156a57fef28ecb6943a85c3c39e4cf5306261397
author Christopher Wiley <wiley@google.com> 1464910046 -0700
committer Christopher Wiley <wiley@google.com> 1464982596 -0700

Always build absolute paths the same way

( cherry-picked from 8decf95ffeffcc8aa14aa743ae398bc38d54b0ac )

Fix a bug where output paths like:

C:\foo\bar

triggered bad logic to detect relative paths and turned the path into

.\C:\foo\bar

Fix this by moving absolute path detection logic into a common helper
function and calling it consistently.

Bug: 29091703
Test: unittests, angler-eng builds with this change, manual testing on
      windows demonstrates issue is fixed

Change-Id: I2431f3dbcc389902d9f133197ec0026c20e75a8c