Fix the check for divide-by-zero in background image tiling

Fix the check for divide-by-zero in background image tiling

A recent patch changed the width used to find the amount of space
when background-repeat is set to space, but did not update the
corresponding zero check. This patch fixes it and adds a test
for zero sized tiles in background painting.

R=leviw@chromium.org
BUG=595141, 594915
Committed: https://crrev.com/d146f1d1b21205841f8982b4fafc87b02b07aa29
Cr-Commit-Position: refs/heads/master@{#382058}

[Stephen Chennney, 2016-03-17 15:43:15]

The CQ bit was checked by schenney@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-03-17 15:43:37]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1812893002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1812893002/1

[Stephen Chennney, 2016-03-17 15:43:59]

I overlooked this on my previous rounding patch. Minor change.

The test hits a divide-by-zero without the patch.

[commit-bot: I haz the power, 2016-03-17 17:01:45]

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

[commit-bot: I haz the power, 2016-03-17 17:01:46]

Dry run: This issue passed the CQ dry run.

[Stephen Chennney, 2016-03-17 19:47:58]

Description was changed from

==========
Fix the check for divide-by-zero in background image tiling

A recent patch changed the width used to find the amount of space
when background-repeat is set to space, but did not update the
corresponding zero check. This patch fixes it and adds a test
for zero sized tiles in background painting.

R=leviw@chromium.org
BUG=595141
==========

to

==========
Fix the check for divide-by-zero in background image tiling

A recent patch changed the width used to find the amount of space
when background-repeat is set to space, but did not update the
corresponding zero check. This patch fixes it and adds a test
for zero sized tiles in background painting.

R=leviw@chromium.org
BUG=595141, 594915
==========

[leviw_travelin_and_unemployed, 2016-03-18 18:40:02]

The CQ bit was checked by leviw@chromium.org

[leviw_travelin_and_unemployed, 2016-03-18 18:40:02]

lgtm

[commit-bot: I haz the power, 2016-03-18 18:41:13]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1812893002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1812893002/1

[commit-bot: I haz the power, 2016-03-18 20:03:21]

Description was changed from

==========
Fix the check for divide-by-zero in background image tiling

A recent patch changed the width used to find the amount of space
when background-repeat is set to space, but did not update the
corresponding zero check. This patch fixes it and adds a test
for zero sized tiles in background painting.

R=leviw@chromium.org
BUG=595141, 594915
==========

to

==========
Fix the check for divide-by-zero in background image tiling

A recent patch changed the width used to find the amount of space
when background-repeat is set to space, but did not update the
corresponding zero check. This patch fixes it and adds a test
for zero sized tiles in background painting.

R=leviw@chromium.org
BUG=595141, 594915
==========

[commit-bot: I haz the power, 2016-03-18 20:03:23]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-03-18 20:06:01]

Description was changed from

==========
Fix the check for divide-by-zero in background image tiling

A recent patch changed the width used to find the amount of space
when background-repeat is set to space, but did not update the
corresponding zero check. This patch fixes it and adds a test
for zero sized tiles in background painting.

R=leviw@chromium.org
BUG=595141, 594915
==========

to

==========
Fix the check for divide-by-zero in background image tiling

A recent patch changed the width used to find the amount of space
when background-repeat is set to space, but did not update the
corresponding zero check. This patch fixes it and adds a test
for zero sized tiles in background painting.

R=leviw@chromium.org
BUG=595141, 594915

Committed: https://crrev.com/d146f1d1b21205841f8982b4fafc87b02b07aa29
Cr-Commit-Position: refs/heads/master@{#382058}
==========

[commit-bot: I haz the power, 2016-03-18 20:06:02]

Patchset 1 (id:??) landed as
https://crrev.com/d146f1d1b21205841f8982b4fafc87b02b07aa29
Cr-Commit-Position: refs/heads/master@{#382058}