Expand to pixels before transform in LayoutBox::MapVisualRectToContainer

Expand to pixels before transform in LayoutBox::MapVisualRectToContainer

This merges the LayoutBox.cpp part of https://crrev.com/469772.
It ensures the paint invalidation rect covers non-translation transformed
contents no matter if the contents are pixel snapped.

BUG=721370
NOTRY=true
NOPRESUBMIT=true
TBR=wangxianzhu@chromium.org

Review-Url: https://codereview.chromium.org/2883753002
Cr-Commit-Position: refs/branch-heads/3071@{#545}
Cr-Branched-From: a106f0abbf69dad349d4aaf4bcc4f5d376dd2377-refs/heads/master@{#464641}
Committed: https://chromium.googlesource.com/chromium/src/+/6ffe68d4df63647d3f30a2bd88aecec16634aec4

[Xianzhu, 2017-05-13 20:46:19]

The CQ bit was checked by wangxianzhu@chromium.org

[commit-bot: I haz the power, 2017-05-13 20:46:30]

CQ is trying da patch.

Follow status at:
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-05-13 20:47:41]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1494708379948630, "parent_rev":
"4582fd82174a35a2cf098d6d9408a216d1f8b34b", "commit_rev":
"6ffe68d4df63647d3f30a2bd88aecec16634aec4"}

[commit-bot: I haz the power, 2017-05-13 20:47:50]

Description was changed from

==========
Expand to pixels before transform in LayoutBox::MapVisualRectToContainer

This merges the LayoutBox.cpp part of https://crrev.com/469772.
It ensures the paint invalidation rect covers non-translation transformed
contents no matter if the contents are pixel snapped.

BUG=721370
NOTRY=true
NOPRESUBMIT=true
TBR=wangxianzhu@chromium.org
==========

to

==========
Expand to pixels before transform in LayoutBox::MapVisualRectToContainer

This merges the LayoutBox.cpp part of https://crrev.com/469772.
It ensures the paint invalidation rect covers non-translation transformed
contents no matter if the contents are pixel snapped.

BUG=721370
NOTRY=true
NOPRESUBMIT=true
TBR=wangxianzhu@chromium.org

Review-Url: https://codereview.chromium.org/2883753002
Cr-Commit-Position: refs/branch-heads/3071@{#545}
Cr-Branched-From:
a106f0abbf69dad349d4aaf4bcc4f5d376dd2377-refs/heads/master@{#464641}
Committed:
https://chromium.googlesource.com/chromium/src/+/6ffe68d4df63647d3f30a2bd88ae...
==========

[commit-bot: I haz the power, 2017-05-13 20:47:51]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/6ffe68d4df63647d3f30a2bd88ae...