Add HTTP-specific metrics for password forms

Add HTTP-specific metrics for password forms

These metrics will help us track the effect of the Form-Not-Secure warnings
(which show a "Login not secure" message in the autofill dropdown on HTTP
pages).

BUG=677291
Review-Url: https://codereview.chromium.org/2667983006
Cr-Commit-Position: refs/heads/master@{#447867}
(cherry picked from commit 0cd28be01ef0b1f4a51d2806c4601264a53d4c53)

Review-Url: https://codereview.chromium.org/2675133004 .
Cr-Commit-Position: refs/branch-heads/2987@{#338}
Cr-Branched-From: ad51088c0e8776e8dcd963dbe752c4035ba6dab6-refs/heads/master@{#444943}
Committed: https://chromium.googlesource.com/chromium/src/+/9fc74678d1552a00425b8a591b540464ccd0f82c

[estark, 2017-02-06 19:08:31]

Description was changed from

==========
Add HTTP-specific metrics for password forms

These metrics will help us track the effect of the Form-Not-Secure warnings
(which show a "Login not secure" message in the autofill dropdown on HTTP
pages).

BUG=677291

Review-Url: https://codereview.chromium.org/2667983006
Cr-Commit-Position: refs/heads/master@{#447867}
(cherry picked from commit 0cd28be01ef0b1f4a51d2806c4601264a53d4c53)
==========

to

==========
Add HTTP-specific metrics for password forms

These metrics will help us track the effect of the Form-Not-Secure warnings
(which show a "Login not secure" message in the autofill dropdown on HTTP
pages).

BUG=677291

Review-Url: https://codereview.chromium.org/2667983006
Cr-Commit-Position: refs/heads/master@{#447867}
(cherry picked from commit 0cd28be01ef0b1f4a51d2806c4601264a53d4c53)

Review-Url: https://codereview.chromium.org/2675133004 .
Cr-Commit-Position: refs/branch-heads/2987@{#338}
Cr-Branched-From:
ad51088c0e8776e8dcd963dbe752c4035ba6dab6-refs/heads/master@{#444943}
Committed:
https://chromium.googlesource.com/chromium/src/+/9fc74678d1552a00425b8a591b54...
==========

[estark, 2017-02-06 19:08:32]

Committed patchset #1 (id:1) manually as
9fc74678d1552a00425b8a591b540464ccd0f82c.