Reland of Make LayoutImageResource::image() parameter explicit

Reland of Make LayoutImageResource::image() parameter explicit (patchset #1 id:1 of https://codereview.chromium.org/1431973002/ )

Reason for revert:
Revert the revert. It looks like "Enable slimming paint synchronized painting" was the culprit this time. Relanding.

Original issue's description:
> Revert of Make LayoutImageResource::image() parameter explicit (patchset #2 id:20001 of https://codereview.chromium.org/1411693006/ )
>
> Reason for revert:
> Seems to have caused 553045
>
> Original issue's description:
> > Make LayoutImageResource::image() parameter explicit
> >
> > It makes the code more explicit and easier to read. No functional
> > change expected.
> >
> > BUG=551419
> >
> > Committed: https://crrev.com/3059b983258e55aeacef6e0b04bdd35a72436d3b
> > Cr-Commit-Position: refs/heads/master@{#358287}
>
> TBR=fs@opera.com
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=551419
>
> Committed: https://crrev.com/20fa2832b2650a8654bfd8226561046760ebbfc9
> Cr-Commit-Position: refs/heads/master@{#358551}

TBR=fs@opera.com
BUG=551419
Committed: https://crrev.com/3360980d098064ddd9f0d6fc01fab1df7f60a7ba
Cr-Commit-Position: refs/heads/master@{#358818}

[davve, 2015-11-10 07:24:34]

Created Reland of Make LayoutImageResource::image() parameter explicit

[davve, 2015-11-10 07:26:33]

Description was changed from

==========
Reland of Make LayoutImageResource::image() parameter explicit (patchset #1 id:1
of https://codereview.chromium.org/1431973002/ )

Reason for revert:
Revert the revert. It looks like "Enable slimming paint synchronized painting"
was the culprit this time. Re-landing.

Original issue's description:
> Revert of Make LayoutImageResource::image() parameter explicit (patchset #2
id:20001 of https://codereview.chromium.org/1411693006/ )
> 
> Reason for revert:
> Seems to have caused 553045
> 
> Original issue's description:
> > Make LayoutImageResource::image() parameter explicit
> >
> > It makes the code more explicit and easier to read. No functional
> > change expected.
> >
> > BUG=551419
> >
> > Committed: https://crrev.com/3059b983258e55aeacef6e0b04bdd35a72436d3b
> > Cr-Commit-Position: refs/heads/master@{#358287}
> 
> TBR=fs@opera.com
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=551419
> 
> Committed: https://crrev.com/20fa2832b2650a8654bfd8226561046760ebbfc9
> Cr-Commit-Position: refs/heads/master@{#358551}

TBR=fs@opera.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=551419
==========

to

==========
Reland of Make LayoutImageResource::image() parameter explicit (patchset #1 id:1
of https://codereview.chromium.org/1431973002/ )

Reason for revert:
Revert the revert. It looks like "Enable slimming paint synchronized painting"
was the culprit this time. Relanding.

Original issue's description:
> Revert of Make LayoutImageResource::image() parameter explicit (patchset #2
id:20001 of https://codereview.chromium.org/1411693006/ )
> 
> Reason for revert:
> Seems to have caused 553045
> 
> Original issue's description:
> > Make LayoutImageResource::image() parameter explicit
> >
> > It makes the code more explicit and easier to read. No functional
> > change expected.
> >
> > BUG=551419
> >
> > Committed: https://crrev.com/3059b983258e55aeacef6e0b04bdd35a72436d3b
> > Cr-Commit-Position: refs/heads/master@{#358287}
> 
> TBR=fs@opera.com
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=551419
> 
> Committed: https://crrev.com/20fa2832b2650a8654bfd8226561046760ebbfc9
> Cr-Commit-Position: refs/heads/master@{#358551}

TBR=fs@opera.com
BUG=551419
==========

[davve, 2015-11-10 07:27:01]

The CQ bit was checked by davve@opera.com to run a CQ dry run

[commit-bot: I haz the power, 2015-11-10 07:27:42]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1431193004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1431193004/1

[commit-bot: I haz the power, 2015-11-10 10:26:49]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-11-10 10:26:50]

Dry run: This issue passed the CQ dry run.

[davve, 2015-11-10 11:01:05]

The CQ bit was checked by davve@opera.com

[commit-bot: I haz the power, 2015-11-10 11:01:37]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1431193004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1431193004/1

[commit-bot: I haz the power, 2015-11-10 11:06:02]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-11-10 11:07:06]

Patchset 1 (id:??) landed as
https://crrev.com/3360980d098064ddd9f0d6fc01fab1df7f60a7ba
Cr-Commit-Position: refs/heads/master@{#358818}