Autofill username when the user interacts with the password field.

Autofill username when the user interacts with the password field.

Previously, when the user clicked on a password field, only this field
was autocompleted with their password. This CL ensures that the username
field is autocompleted as well.

If the user interacts with a password field then the username is filled
only if it was empty or *autofilled*, i.e. the user-supplied data is
never overridden.

Note that this works only if the username field was found.

BUG=710374, 708605, 708602
Review-Url: https://codereview.chromium.org/2902113004
Cr-Original-Commit-Position: refs/heads/master@{#475329}
Review-Url: https://codereview.chromium.org/2910403003 .
Cr-Commit-Position: refs/branch-heads/3112@{#51}
Cr-Branched-From: b6460e24cf59f429d69de255538d0fc7a425ccf9-refs/heads/master@{#474897}
Committed: https://chromium.googlesource.com/chromium/src/+/27a63fbaf769d23df0973c9d01ee9763ce3ca862

[pkalinnikov, 2017-05-31 13:46:30]

Description was changed from

==========
Autofill username when the user interacts with the password field.

Previously, when the user clicked on a password field, only this field
was autocompleted with their password. This CL ensures that the username
field is autocompleted as well.

If the user interacts with a password field then the username is filled
only if it was empty or *autofilled*, i.e. the user-supplied data is
never overridden.

Note that this works only if the username field was found.

BUG=710374,708605,708602

Review-Url: https://codereview.chromium.org/2902113004
Cr-Commit-Position: refs/heads/master@{#475329}
(cherry picked from commit 97b7f62478df1974a2742137afe572f3621464af)
==========

to

==========
Autofill username when the user interacts with the password field.

Previously, when the user clicked on a password field, only this field
was autocompleted with their password. This CL ensures that the username
field is autocompleted as well.

If the user interacts with a password field then the username is filled
only if it was empty or *autofilled*, i.e. the user-supplied data is
never overridden.

Note that this works only if the username field was found.

BUG=710374,708605,708602

Review-Url: https://codereview.chromium.org/2902113004
Cr-Original-Commit-Position: refs/heads/master@{#475329}
Review-Url: https://codereview.chromium.org/2910403003 .
Cr-Commit-Position: refs/branch-heads/3112@{#51}
Cr-Branched-From:
b6460e24cf59f429d69de255538d0fc7a425ccf9-refs/heads/master@{#474897}
Committed:
https://chromium.googlesource.com/chromium/src/+/27a63fbaf769d23df0973c9d01ee...
==========

[pkalinnikov, 2017-05-31 13:46:32]

Committed patchset #1 (id:1) manually as
27a63fbaf769d23df0973c9d01ee9763ce3ca862.