Merge of "Add attempt count metric to FaviconHandler" into M59.

Merge of "Add attempt count metric to FaviconHandler" into M59.

This is a merge of https://codereview.chromium.org/2781093002 into M59
(3071). Done on behalf of fhorschig@.

Reason: recording metrics in M59 (and not waiting for M60).

=== Original description ===

The histograms this metric introduces aggregates how many download
attempts were needed to determine the best-fitting favicon.

This is stored in two metrics in order to separate requests for large
icons.

BUG=672939
Review-Url: https://codereview.chromium.org/2781093002
Cr-Commit-Position: refs/heads/master@{#465526}
(cherry picked from commit a9fb2c3cf6bc9b4877d9c21f9f12094fb5c26ecd)

Review-Url: https://codereview.chromium.org/2839573002 .
Cr-Commit-Position: refs/branch-heads/3071@{#157}
Cr-Branched-From: a106f0abbf69dad349d4aaf4bcc4f5d376dd2377-refs/heads/master@{#464641}
Committed: https://chromium.googlesource.com/chromium/src/+/29f35e1cdef86ccb133616795b0845130d2cad86

[vitaliii, 2017-04-24 08:23:00]

Description was changed from

==========
Merge of "Add attempt count metric to FaviconHandler" into M59.

This is a merge of https://codereview.chromium.org/2781093002 into M59
(3071). Done on behalf of fhorschig@.

Reason: recording metrics in M59 (and not waiting for M60).

=== Original description ===

The histograms this metric introduces aggregates how many download
attempts were needed to determine the best-fitting favicon.

This is stored in two metrics in order to separate requests for large
icons.

BUG=672939

Review-Url: https://codereview.chromium.org/2781093002
Cr-Commit-Position: refs/heads/master@{#465526}
(cherry picked from commit a9fb2c3cf6bc9b4877d9c21f9f12094fb5c26ecd)
==========

to

==========
Merge of "Add attempt count metric to FaviconHandler" into M59.

This is a merge of https://codereview.chromium.org/2781093002 into M59
(3071). Done on behalf of fhorschig@.

Reason: recording metrics in M59 (and not waiting for M60).

=== Original description ===

The histograms this metric introduces aggregates how many download
attempts were needed to determine the best-fitting favicon.

This is stored in two metrics in order to separate requests for large
icons.

BUG=672939

Review-Url: https://codereview.chromium.org/2781093002
Cr-Commit-Position: refs/heads/master@{#465526}
(cherry picked from commit a9fb2c3cf6bc9b4877d9c21f9f12094fb5c26ecd)

Review-Url: https://codereview.chromium.org/2839573002 .
Cr-Commit-Position: refs/branch-heads/3071@{#157}
Cr-Branched-From:
a106f0abbf69dad349d4aaf4bcc4f5d376dd2377-refs/heads/master@{#464641}
Committed:
https://chromium.googlesource.com/chromium/src/+/29f35e1cdef86ccb133616795b08...
==========

[vitaliii, 2017-04-24 08:23:02]

Committed patchset #1 (id:1) manually as
29f35e1cdef86ccb133616795b0845130d2cad86.