Reland: Notifications: Split up image loading histograms by image type

Reland: Notifications: Split up image loading histograms by image type

Reland of https://codereview.chromium.org/2540763002 which was reverted
in https://codereview.chromium.org/2540423003. Test has been fixed.

It'll be useful to compare timings and byte sizes for the
different image types (content image, icon, badge, action icon).

BUG=669621, 614456
Review-Url: https://codereview.chromium.org/2544613004
Cr-Commit-Position: refs/heads/master@{#435705}
(cherry picked from commit 548de683cebfaf09526f22bfa922512a114c251a)

Committed: https://chromium.googlesource.com/chromium/src/+/d91470167eb9d96442978d3bf17632aa5e5c7d05

[johnme, 2016-12-06 11:59:44]

Description was changed from

==========
Reland: Notifications: Split up image loading histograms by image type

Reland of https://codereview.chromium.org/2540763002 which was reverted
in https://codereview.chromium.org/2540423003. Test has been fixed.

It'll be useful to compare timings and byte sizes for the
different image types (content image, icon, badge, action icon).

BUG=669621, 614456

Review-Url: https://codereview.chromium.org/2544613004
Cr-Commit-Position: refs/heads/master@{#435705}
(cherry picked from commit 548de683cebfaf09526f22bfa922512a114c251a)
==========

to

==========
Reland: Notifications: Split up image loading histograms by image type

Reland of https://codereview.chromium.org/2540763002 which was reverted
in https://codereview.chromium.org/2540423003. Test has been fixed.

It'll be useful to compare timings and byte sizes for the
different image types (content image, icon, badge, action icon).

BUG=669621, 614456

Review-Url: https://codereview.chromium.org/2544613004
Cr-Commit-Position: refs/heads/master@{#435705}
(cherry picked from commit 548de683cebfaf09526f22bfa922512a114c251a)

Committed:
https://chromium.googlesource.com/chromium/src/+/d91470167eb9d96442978d3bf176...
==========

[johnme, 2016-12-06 11:59:45]

Committed patchset #1 (id:1) manually as
d91470167eb9d96442978d3bf17632aa5e5c7d05.