Merge "INPUT/TEXTAREA elements: Fix incorrect selectionStart/selectionEnd values after blur." to M59

Merge "INPUT/TEXTAREA elements: Fix incorrect selectionStart/selectionEnd values after blur." to M59

We failed to update selectionStart/selectionEnd cache because
TextControlElement::SelectionChanged() is not called in some cases after
crrev.com/450370.

After this CL, selection values are cached in webkitEditableContentChanged event
handling code too.  It is called on every DOM mutation in text control editor.

BUG=714425
Review-Url: https://codereview.chromium.org/2878613002
Cr-Original-Commit-Position: refs/heads/master@{#471290}
Review-Url: https://codereview.chromium.org/2882953002 .
Cr-Commit-Position: refs/branch-heads/3071@{#549}
Cr-Branched-From: a106f0abbf69dad349d4aaf4bcc4f5d376dd2377-refs/heads/master@{#464641}
Committed: https://chromium.googlesource.com/chromium/src/+/e05011e0add858f12cb6f90cc534415870d9f7af

[tkent, 2017-05-15 05:57:16]

Description was changed from

==========
Merge "INPUT/TEXTAREA elements: Fix incorrect selectionStart/selectionEnd values
after blur." to M59

We failed to update selectionStart/selectionEnd cache because
TextControlElement::SelectionChanged() is not called in some cases after
crrev.com/450370.

After this CL, selection values are cached in webkitEditableContentChanged event
handling code too.  It is called on every DOM mutation in text control editor.

BUG=714425

Review-Url: https://codereview.chromium.org/2878613002
Cr-Commit-Position: refs/heads/master@{#471290}
(cherry picked from commit e71aa45ab3098edca75725a658d3624f5ed47108)
==========

to

==========
Merge "INPUT/TEXTAREA elements: Fix incorrect selectionStart/selectionEnd values
after blur." to M59

We failed to update selectionStart/selectionEnd cache because
TextControlElement::SelectionChanged() is not called in some cases after
crrev.com/450370.

After this CL, selection values are cached in webkitEditableContentChanged event
handling code too.  It is called on every DOM mutation in text control editor.

BUG=714425

Review-Url: https://codereview.chromium.org/2878613002
Cr-Original-Commit-Position: refs/heads/master@{#471290}
Review-Url: https://codereview.chromium.org/2882953002 .
Cr-Commit-Position: refs/branch-heads/3071@{#549}
Cr-Branched-From:
a106f0abbf69dad349d4aaf4bcc4f5d376dd2377-refs/heads/master@{#464641}
Committed:
https://chromium.googlesource.com/chromium/src/+/e05011e0add858f12cb6f90cc534...
==========

[tkent, 2017-05-15 05:57:17]

Committed patchset #1 (id:1) manually as
e05011e0add858f12cb6f90cc534415870d9f7af.