Add metrics for paths in file scheme exceptions in content settings.

Add metrics for paths in file scheme exceptions in content settings.

These will tell how often file scheme exceptions have a non-empty
path vs. a wildcard path, and which content settings types use them.

BUG=628759, 621724
Review-Url: https://codereview.chromium.org/2367683002
Cr-Commit-Position: refs/heads/master@{#421248}
(cherry picked from commit 37df8891dff743a4a693575058ce22ca22adbe2a)

Committed: https://chromium.googlesource.com/chromium/src/+/a60ed7ff6c56075b5b3ae018d527f397c2869ca9

[alexmos, 2016-09-28 18:37:53]

Description was changed from

==========
Add metrics for paths in file scheme exceptions in content settings.

These will tell how often file scheme exceptions have a non-empty
path vs. a wildcard path, and which content settings types use them.

BUG=628759, 621724

Review-Url: https://codereview.chromium.org/2367683002
Cr-Commit-Position: refs/heads/master@{#421248}
(cherry picked from commit 37df8891dff743a4a693575058ce22ca22adbe2a)
==========

to

==========
Add metrics for paths in file scheme exceptions in content settings.

These will tell how often file scheme exceptions have a non-empty
path vs. a wildcard path, and which content settings types use them.

BUG=628759, 621724

Review-Url: https://codereview.chromium.org/2367683002
Cr-Commit-Position: refs/heads/master@{#421248}
(cherry picked from commit 37df8891dff743a4a693575058ce22ca22adbe2a)

Committed:
https://chromium.googlesource.com/chromium/src/+/a60ed7ff6c56075b5b3ae018d527...
==========

[alexmos, 2016-09-28 18:37:55]

Committed patchset #1 (id:1) manually as
a60ed7ff6c56075b5b3ae018d527f397c2869ca9.