Add two UseCounters for form.imageName and form.elements.imageName.

Add two UseCounters for form.imageName and form.elements.imageName.

https://groups.google.com/a/chromium.org/forum/#!msg/blink-dev/DPFNigRT6Dc/5ck9egACBAAJ
>  A) What the specification defines; form.imageName where |imageName| is a
>  descendant of |form|.
>
>  B) What the specification lacks, and all browsers agree; form.imageName where
>  |imageName| is not a descendant of |form| and is associated by HTML parser.
>
>  C) WebKit-only quirk:  form.elements.imageName

This CL adds
  UseCounter::FormNameAccessForNonDescendantImageElement for B.
  UseCounter::FormControlsCollectionNameAccessForImageElement for C.

BUG=570151
Review URL: https://codereview.chromium.org/1529033002

Cr-Commit-Position: refs/heads/master@{#365468}
(cherry picked from commit dc1e9e51df9ef1b02bc0b9045c5fe2a64fc3b79f)

Committed: https://chromium.googlesource.com/chromium/src/+/3364ba098e28aa105a26116308bc832e4eeed122

[tkent, 2015-12-18 07:18:53]

Description was changed from

==========
Add two UseCounters for form.imageName and form.elements.imageName.

https://groups.google.com/a/chromium.org/forum/#!msg/blink-dev/DPFNigRT6Dc/5c...
>  A) What the specification defines; form.imageName where |imageName| is a
>  descendant of |form|.
>
>  B) What the specification lacks, and all browsers agree; form.imageName where
>  |imageName| is not a descendant of |form| and is associated by HTML parser.
>
>  C) WebKit-only quirk:  form.elements.imageName

This CL adds
  UseCounter::FormNameAccessForNonDescendantImageElement for B.
  UseCounter::FormControlsCollectionNameAccessForImageElement for C.

BUG=570151

Review URL: https://codereview.chromium.org/1529033002

Cr-Commit-Position: refs/heads/master@{#365468}
(cherry picked from commit dc1e9e51df9ef1b02bc0b9045c5fe2a64fc3b79f)
==========

to

==========
Add two UseCounters for form.imageName and form.elements.imageName.

https://groups.google.com/a/chromium.org/forum/#!msg/blink-dev/DPFNigRT6Dc/5c...
>  A) What the specification defines; form.imageName where |imageName| is a
>  descendant of |form|.
>
>  B) What the specification lacks, and all browsers agree; form.imageName where
>  |imageName| is not a descendant of |form| and is associated by HTML parser.
>
>  C) WebKit-only quirk:  form.elements.imageName

This CL adds
  UseCounter::FormNameAccessForNonDescendantImageElement for B.
  UseCounter::FormControlsCollectionNameAccessForImageElement for C.

BUG=570151

Review URL: https://codereview.chromium.org/1529033002

Cr-Commit-Position: refs/heads/master@{#365468}
(cherry picked from commit dc1e9e51df9ef1b02bc0b9045c5fe2a64fc3b79f)

Committed:
https://chromium.googlesource.com/chromium/src/+/3364ba098e28aa105a26116308bc...
==========

[tkent, 2015-12-18 07:18:55]

Committed patchset #1 (id:1) manually as
3364ba098e28aa105a26116308bc832e4eeed122.