Merge "ExternalPopupMenu should recreate its popup only if a SELECT subtree is updated" to M51

Merge "ExternalPopupMenu should recreate its popup only if a SELECT subtree is updated" to M51

crbug.com/608140 happens because animation on a SELECT element causes
multiple didRecalcStyle calls, and ExternalPopupMenu::updateFromElement
recreates a popup by a HEAD element change.

This CL adds a |reason| argument to PopupMenu::updateFromElement. It is one of
BySelectionChange, ByStyleChange, and ByDOMCHange. ExternalPopupMenu doesn't
recreates its popup if the |reason| is ByStyleChange because ExternalPopupMenu
doesn't support styling.

BUG=608140
Review-Url: https://codereview.chromium.org/1970653003
Cr-Commit-Position: refs/heads/master@{#392965}
(cherry picked from commit 1d5b6507ac2cbfdbb733cbefa1dbbce091b11a06)

Committed: https://chromium.googlesource.com/chromium/src/+/b752c263dea6d780e5814be537f4a18732ac5409

[tkent, 2016-05-12 23:12:33]

Description was changed from

==========
Merge "ExternalPopupMenu should recreate its popup only if a SELECT subtree is
updated" to M51

crbug.com/608140 happens because animation on a SELECT element causes
multiple didRecalcStyle calls, and ExternalPopupMenu::updateFromElement
recreates a popup by a HEAD element change.

This CL adds a |reason| argument to PopupMenu::updateFromElement. It is one of
BySelectionChange, ByStyleChange, and ByDOMCHange. ExternalPopupMenu doesn't
recreates its popup if the |reason| is ByStyleChange because ExternalPopupMenu
doesn't support styling.

BUG=608140

Review-Url: https://codereview.chromium.org/1970653003
Cr-Commit-Position: refs/heads/master@{#392965}
(cherry picked from commit 1d5b6507ac2cbfdbb733cbefa1dbbce091b11a06)
==========

to

==========
Merge "ExternalPopupMenu should recreate its popup only if a SELECT subtree is
updated" to M51

crbug.com/608140 happens because animation on a SELECT element causes
multiple didRecalcStyle calls, and ExternalPopupMenu::updateFromElement
recreates a popup by a HEAD element change.

This CL adds a |reason| argument to PopupMenu::updateFromElement. It is one of
BySelectionChange, ByStyleChange, and ByDOMCHange. ExternalPopupMenu doesn't
recreates its popup if the |reason| is ByStyleChange because ExternalPopupMenu
doesn't support styling.

BUG=608140

Review-Url: https://codereview.chromium.org/1970653003
Cr-Commit-Position: refs/heads/master@{#392965}
(cherry picked from commit 1d5b6507ac2cbfdbb733cbefa1dbbce091b11a06)

Committed:
https://chromium.googlesource.com/chromium/src/+/b752c263dea6d780e5814be537f4...
==========

[tkent, 2016-05-12 23:12:35]

Committed patchset #1 (id:1) manually as
b752c263dea6d780e5814be537f4a18732ac5409.