Fix bug in SkGifCodec / Switch SkImageDec tests to use Codec

Fix bug in SkGifCodec / Switch SkImageDec tests to use Codec

cherry of 7f7ec206de39fde8dc490e9feb0f65322af1b989 in master

Original commit message below:

========================================================================

Fix bug in SkGifCodec / Switch SkImageDec tests to use Codec

SkImageDecoder is still used throughout tests, tools, gms etc.
Deleting it from tests is an easy first step.

Bonus is that we add tests of SkCodec.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1733863003

Review URL: https://codereview.chromium.org/1733863003
NOTREECHECKS=true
NOTRY=true
NOPRESUBMIT=true

Committed: https://skia.googlesource.com/skia/+/c671b4fe1ad95a88acc2234f33dfc65b84e0c37f

[scroggo, 2016-03-03 17:42:25]

Description was changed from

==========
Fix bug in SkGifCodec / Switch SkImageDec tests to use Codec

SkImageDecoder is still used throughout tests, tools, gms etc.
Deleting it from tests is an easy first step.

Bonus is that we add tests of SkCodec.

BUG=skia:
GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...

Review URL: https://codereview.chromium.org/1733863003
==========

to

==========
Fix bug in SkGifCodec / Switch SkImageDec tests to use Codec

SkImageDecoder is still used throughout tests, tools, gms etc.
Deleting it from tests is an easy first step.

Bonus is that we add tests of SkCodec.

BUG=skia:
GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...

Review URL: https://codereview.chromium.org/1733863003
NOTREECHECKS=true
NOTRY=true
NOPRESUBMIT=true
==========

[scroggo, 2016-03-03 17:44:28]

Description was changed from

==========
Fix bug in SkGifCodec / Switch SkImageDec tests to use Codec

SkImageDecoder is still used throughout tests, tools, gms etc.
Deleting it from tests is an easy first step.

Bonus is that we add tests of SkCodec.

BUG=skia:
GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...

Review URL: https://codereview.chromium.org/1733863003
NOTREECHECKS=true
NOTRY=true
NOPRESUBMIT=true
==========

to

==========
Fix bug in SkGifCodec / Switch SkImageDec tests to use Codec

cherry of 7f7ec206de39fde8dc490e9feb0f65322af1b989 in master

Original commit message below:

========================================================================

Fix bug in SkGifCodec / Switch SkImageDec tests to use Codec

SkImageDecoder is still used throughout tests, tools, gms etc.
Deleting it from tests is an easy first step.

Bonus is that we add tests of SkCodec.

BUG=skia:
GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...

Review URL: https://codereview.chromium.org/1733863003
NOTREECHECKS=true
NOTRY=true
NOPRESUBMIT=true
==========

[scroggo, 2016-03-03 17:44:55]

scroggo@google.com changed reviewers:
+ msarett@google.com

[msarett, 2016-03-03 17:46:20]

lgtm

[scroggo, 2016-03-03 17:48:21]

The CQ bit was checked by scroggo@google.com

[commit-bot: I haz the power, 2016-03-03 17:48:29]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1757333002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1757333002/1

[commit-bot: I haz the power, 2016-03-03 17:48:41]

Description was changed from

==========
Fix bug in SkGifCodec / Switch SkImageDec tests to use Codec

cherry of 7f7ec206de39fde8dc490e9feb0f65322af1b989 in master

Original commit message below:

========================================================================

Fix bug in SkGifCodec / Switch SkImageDec tests to use Codec

SkImageDecoder is still used throughout tests, tools, gms etc.
Deleting it from tests is an easy first step.

Bonus is that we add tests of SkCodec.

BUG=skia:
GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...

Review URL: https://codereview.chromium.org/1733863003
NOTREECHECKS=true
NOTRY=true
NOPRESUBMIT=true
==========

to

==========
Fix bug in SkGifCodec / Switch SkImageDec tests to use Codec

cherry of 7f7ec206de39fde8dc490e9feb0f65322af1b989 in master

Original commit message below:

========================================================================

Fix bug in SkGifCodec / Switch SkImageDec tests to use Codec

SkImageDecoder is still used throughout tests, tools, gms etc.
Deleting it from tests is an easy first step.

Bonus is that we add tests of SkCodec.

BUG=skia:
GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...

Review URL: https://codereview.chromium.org/1733863003
NOTREECHECKS=true
NOTRY=true
NOPRESUBMIT=true

Committed:
https://skia.googlesource.com/skia/+/c671b4fe1ad95a88acc2234f33dfc65b84e0c37f
==========

[commit-bot: I haz the power, 2016-03-03 17:48:42]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/c671b4fe1ad95a88acc2234f33dfc65b84e0c37f