Check node->layoutObject in CaretBase::caretLayoutObject

Check node->layoutObject in CaretBase::caretLayoutObject

In CaretBase::caretLayoutObject(Node* node),
if caretRendersInsideNode(node) calls HTMLMeterElement::canContainRangeEndPoint,
 it updates the layout tree.  It means LayoutObject for the METER can be deleted.
This is bad design. We should make caret painting algorithm clean.

BUG=608817
Review-Url: https://codereview.chromium.org/1972523002
Cr-Commit-Position: refs/heads/master@{#395822}
(cherry picked from commit e4edfb63d1b068c5ab5dc6b91edf75c108ebc433)

Committed: https://chromium.googlesource.com/chromium/src/+/59c23e7f2a1eeeafa8040eb50a193f2e3a29a02f

[yoichio, 2016-06-07 02:23:54]

Description was changed from

==========
Check node->layoutObject in CaretBase::caretLayoutObject

In CaretBase::caretLayoutObject(Node* node),
if caretRendersInsideNode(node) calls HTMLMeterElement::canContainRangeEndPoint,
 it updates the layout tree.  It means LayoutObject for the METER can be
deleted.
This is bad design. We should make caret painting algorithm clean.

BUG=608817

Review-Url: https://codereview.chromium.org/1972523002
Cr-Commit-Position: refs/heads/master@{#395822}
(cherry picked from commit e4edfb63d1b068c5ab5dc6b91edf75c108ebc433)
==========

to

==========
Check node->layoutObject in CaretBase::caretLayoutObject

In CaretBase::caretLayoutObject(Node* node),
if caretRendersInsideNode(node) calls HTMLMeterElement::canContainRangeEndPoint,
 it updates the layout tree.  It means LayoutObject for the METER can be
deleted.
This is bad design. We should make caret painting algorithm clean.

BUG=608817

Review-Url: https://codereview.chromium.org/1972523002
Cr-Commit-Position: refs/heads/master@{#395822}
(cherry picked from commit e4edfb63d1b068c5ab5dc6b91edf75c108ebc433)

Committed:
https://chromium.googlesource.com/chromium/src/+/59c23e7f2a1eeeafa8040eb50a19...
==========

[yoichio, 2016-06-07 02:23:57]

Committed patchset #1 (id:1) manually as
59c23e7f2a1eeeafa8040eb50a193f2e3a29a02f.