Make rebase_path() aware of Windows drive letter capitalization

Make rebase_path() aware of Windows drive letter capitalization

Make sure rebase_path() supports both capital and non-capital Windows path
drive letters. It's unable to find common path prefix otherwise.

BUG=596072
Committed: https://crrev.com/01a402cd6fb6873e61d2faa269b6b991d307635e
Cr-Commit-Position: refs/heads/master@{#382532}

[Tomasz Moniuszko, 2016-03-18 16:10:05]

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

[brettw, 2016-03-21 23:27:07]

lgtm

[Tomasz Moniuszko, 2016-03-22 08:00:21]

The CQ bit was checked by tmoniuszko@opera.com

[commit-bot: I haz the power, 2016-03-22 08:00:34]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1817533002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1817533002/1

[commit-bot: I haz the power, 2016-03-22 08:30:23]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-03-22 08:33:19]

Description was changed from

==========
Make rebase_path() aware of Windows drive letter capitalization

Make sure rebase_path() supports both capital and non-capital Windows path
drive letters. It's unable to find common path prefix otherwise.

BUG=596072
==========

to

==========
Make rebase_path() aware of Windows drive letter capitalization

Make sure rebase_path() supports both capital and non-capital Windows path
drive letters. It's unable to find common path prefix otherwise.

BUG=596072

Committed: https://crrev.com/01a402cd6fb6873e61d2faa269b6b991d307635e
Cr-Commit-Position: refs/heads/master@{#382532}
==========

[commit-bot: I haz the power, 2016-03-22 08:33:20]

Patchset 1 (id:??) landed as
https://crrev.com/01a402cd6fb6873e61d2faa269b6b991d307635e
Cr-Commit-Position: refs/heads/master@{#382532}