Don't dirty MIP chain when damage bounds is empty

Don't dirty MIP chain when damage bounds is empty
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1618383002

Committed: https://skia.googlesource.com/skia/+/a9909121ebdd35fb8d8694103a443f230ffa3a3a

[bsalomon, 2016-01-22 15:53:37]

Description was changed from

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Don't dirty MIP chain when damage bounds is empty
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to

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Don't dirty MIP chain when damage bounds is empty
GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...
==========

[bsalomon, 2016-01-22 15:59:59]

bsalomon@google.com changed reviewers:
+ robertphillips@google.com

[bsalomon, 2016-01-22 16:00:06]

The CQ bit was checked by bsalomon@google.com to run a CQ dry run

[commit-bot: I haz the power, 2016-01-22 16:00:08]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1618383002/40001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1618383002/40001

[robertphillips, 2016-01-22 16:01:07]

lgtm

[commit-bot: I haz the power, 2016-01-22 16:13:35]

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

[commit-bot: I haz the power, 2016-01-22 16:13:35]

Dry run: This issue passed the CQ dry run.

[bsalomon, 2016-01-23 18:29:19]

The CQ bit was checked by bsalomon@google.com

[commit-bot: I haz the power, 2016-01-23 18:29:24]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1618383002/40001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1618383002/40001

[commit-bot: I haz the power, 2016-01-23 18:41:43]

Description was changed from

==========
Don't dirty MIP chain when damage bounds is empty
GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...
==========

to

==========
Don't dirty MIP chain when damage bounds is empty
GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...

Committed:
https://skia.googlesource.com/skia/+/a9909121ebdd35fb8d8694103a443f230ffa3a3a
==========

[commit-bot: I haz the power, 2016-01-23 18:41:43]

Committed patchset #3 (id:40001) as
https://skia.googlesource.com/skia/+/a9909121ebdd35fb8d8694103a443f230ffa3a3a