Fix GN freeze on generating Visual Studio projects

Fix GN freeze on generating Visual Studio projects

There's an infinite loop while searching for parent directory. It happens
when drive letter case is mixed in absolute paths on Windows (/C:/foo and
/c:/foo). It's easily reproducible on MSYS terminals when system-absolute
paths are used for some targets and source root-absolute (//foo/bar) paths
are used for other targets.

BUG=

Committed: https://crrev.com/e4b98e2d9ff4fceae0d515d5795e677ff4518223
Cr-Commit-Position: refs/heads/master@{#388443}

[Tomasz Moniuszko, 2016-04-19 10:35:34]

tmoniuszko@opera.com changed reviewers:
+ brettw@chromium.org

[brettw, 2016-04-19 17:55:51]

lgtm

[brettw, 2016-04-19 22:28:22]

The CQ bit was checked by brettw@chromium.org

[commit-bot: I haz the power, 2016-04-19 22:28:46]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1897213002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1897213002/1

[commit-bot: I haz the power, 2016-04-19 22:31:03]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-04-19 22:31:04]

Try jobs failed on following builders:
  ios_rel_device_gn on tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/ios_rel_device_gn...)
  ios_rel_device_ninja on tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/ios_rel_device_ni...)
  mac_chromium_rel_ng on tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/mac_chromium_rel_...)

[Tomasz Moniuszko, 2016-04-20 07:38:06]

The CQ bit was checked by tmoniuszko@opera.com

[Tomasz Moniuszko, 2016-04-20 07:38:06]

The patchset sent to the CQ was uploaded after l-g-t-m from brettw@chromium.org
Link to the patchset: https://codereview.chromium.org/1897213002/#ps20001
(title: "Rebase patch onto current master")

[commit-bot: I haz the power, 2016-04-20 07:38:12]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1897213002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1897213002/20001

[commit-bot: I haz the power, 2016-04-20 08:17:51]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-04-22 19:21:30]

Description was changed from

==========
Fix GN freeze on generating Visual Studio projects

There's an infinite loop while searching for parent directory. It happens
when drive letter case is mixed in absolute paths on Windows (/C:/foo and
/c:/foo). It's easily reproducible on MSYS terminals when system-absolute
paths are used for some targets and source root-absolute (//foo/bar) paths
are used for other targets.

BUG=
==========

to

==========
Fix GN freeze on generating Visual Studio projects

There's an infinite loop while searching for parent directory. It happens
when drive letter case is mixed in absolute paths on Windows (/C:/foo and
/c:/foo). It's easily reproducible on MSYS terminals when system-absolute
paths are used for some targets and source root-absolute (//foo/bar) paths
are used for other targets.

BUG=

Committed: https://crrev.com/e4b98e2d9ff4fceae0d515d5795e677ff4518223
Cr-Commit-Position: refs/heads/master@{#388443}
==========

[commit-bot: I haz the power, 2016-04-22 19:21:31]

Patchset 2 (id:??) landed as
https://crrev.com/e4b98e2d9ff4fceae0d515d5795e677ff4518223
Cr-Commit-Position: refs/heads/master@{#388443}