Reland of ix misc asserts and checks found by fuzzer

Reland of ix misc asserts and checks found by fuzzer (patchset #1 id:1 of https://codereview.chromium.org/1713413002/ )

Reason for revert:
deps instability seemingly fixed. trying again.

Original issue's description:
> Revert of fix misc asserts and checks found by fuzzer (patchset #1 id:1 of https://codereview.chromium.org/1713383002/ )
> 
> Reason for revert:
> speculative deps-roll fix
> 
> Original issue's description:
> > fix misc asserts and checks found by fuzzer
> > 
> > BUG=skia:
> > GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1713383002
> > 
> > TBR=robertphilips
> > 
> > Committed: https://skia.googlesource.com/skia/+/00bea4ad310c4ec4dd95809b47ce3fbfa8fd0e1e
> 
> TBR=robertphillips@google.com
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=skia:
> 
> Committed: https://skia.googlesource.com/skia/+/d98ef6377269e3596423225ab922301ed40529a0

TBR=robertphillips@google.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Committed: https://skia.googlesource.com/skia/+/75a73297cb44c65a9efcf5f212854cb457140e34

[reed1, 2016-02-22 13:54:42]

Created Reland of ix misc asserts and checks found by fuzzer

[commit-bot: I haz the power, 2016-02-22 13:54:46]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1723473002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1723473002/1

[commit-bot: I haz the power, 2016-02-22 13:54:58]

Description was changed from

==========
Reland of ix misc asserts and checks found by fuzzer (patchset #1 id:1 of
https://codereview.chromium.org/1713413002/ )

Reason for revert:
deps instability seemingly fixed. trying again.

Original issue's description:
> Revert of fix misc asserts and checks found by fuzzer (patchset #1 id:1 of
https://codereview.chromium.org/1713383002/ )
> 
> Reason for revert:
> speculative deps-roll fix
> 
> Original issue's description:
> > fix misc asserts and checks found by fuzzer
> > 
> > BUG=skia:
> > GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...
> > 
> > TBR=robertphilips
> > 
> > Committed:
https://skia.googlesource.com/skia/+/00bea4ad310c4ec4dd95809b47ce3fbfa8fd0e1e
> 
> TBR=robertphillips@google.com
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=skia:
> 
> Committed:
https://skia.googlesource.com/skia/+/d98ef6377269e3596423225ab922301ed40529a0

TBR=robertphillips@google.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:
==========

to

==========
Reland of ix misc asserts and checks found by fuzzer (patchset #1 id:1 of
https://codereview.chromium.org/1713413002/ )

Reason for revert:
deps instability seemingly fixed. trying again.

Original issue's description:
> Revert of fix misc asserts and checks found by fuzzer (patchset #1 id:1 of
https://codereview.chromium.org/1713383002/ )
> 
> Reason for revert:
> speculative deps-roll fix
> 
> Original issue's description:
> > fix misc asserts and checks found by fuzzer
> > 
> > BUG=skia:
> > GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...
> > 
> > TBR=robertphilips
> > 
> > Committed:
https://skia.googlesource.com/skia/+/00bea4ad310c4ec4dd95809b47ce3fbfa8fd0e1e
> 
> TBR=robertphillips@google.com
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=skia:
> 
> Committed:
https://skia.googlesource.com/skia/+/d98ef6377269e3596423225ab922301ed40529a0

TBR=robertphillips@google.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Committed:
https://skia.googlesource.com/skia/+/75a73297cb44c65a9efcf5f212854cb457140e34
==========

[commit-bot: I haz the power, 2016-02-22 13:54:59]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/75a73297cb44c65a9efcf5f212854cb457140e34

[reed1, 2016-02-22 13:57:16]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/1723483002/ by reed@google.com.

The reason for reverting is: need to not land the canvas change yet
.