Fix zero-sized blur with crop rect.

Fix zero-sized blur with crop rect.

[Cherry-pick of 6404981b0c3984ba91b3bda35e60c6c8a8a773c2 to chrome/m49.]

Neither the GPU nor CPU paths were correctly handling the crop rect
in this case.

NOTE: this change adds a new test case to the imageblurcropped GM, so
it will have to be rebaselined.

BUG=skia:4876
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1657773002
NOTREECHECKS=true
NOTRY=true
NOPRESUBMIT=true

Committed: https://skia.googlesource.com/skia/+/3a2b4d5906625f5178e6da69c1f62ab4e6f275e7

[Stephen White, 2016-02-03 14:38:17]

Description was changed from

==========
Fix zero-sized blur with crop rect.

[Cherry-pick of 6404981b0c3984ba91b3bda35e60c6c8a8a773c2 to chrome/m49.]

Neither the GPU nor CPU paths were correctly handling the crop rect
in this case.

NOTE: this change adds a new test case to the imageblurcropped GM, so
it will have to be rebaselined.

BUG=skia:4876
GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...
==========

to

==========
Fix zero-sized blur with crop rect.

[Cherry-pick of 6404981b0c3984ba91b3bda35e60c6c8a8a773c2 to chrome/m49.]

Neither the GPU nor CPU paths were correctly handling the crop rect
in this case.

NOTE: this change adds a new test case to the imageblurcropped GM, so
it will have to be rebaselined.

BUG=skia:4876
GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...
NOTREECHECKS=true
NOTRY=true
NOPRESUBMIT=true
==========

[Stephen White, 2016-02-03 14:38:50]

Description was changed from

==========
Fix zero-sized blur with crop rect.

[Cherry-pick of 6404981b0c3984ba91b3bda35e60c6c8a8a773c2 to chrome/m49.]

Neither the GPU nor CPU paths were correctly handling the crop rect
in this case.

NOTE: this change adds a new test case to the imageblurcropped GM, so
it will have to be rebaselined.

BUG=skia:4876
GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...
NOTREECHECKS=true
NOTRY=true
NOPRESUBMIT=true
==========

to

==========
Fix zero-sized blur with crop rect.

[Cherry-pick of 6404981b0c3984ba91b3bda35e60c6c8a8a773c2 to chrome/m49.]

Neither the GPU nor CPU paths were correctly handling the crop rect
in this case.

NOTE: this change adds a new test case to the imageblurcropped GM, so
it will have to be rebaselined.

BUG=skia:4876
GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...
NOTREECHECKS=true
NOTRY=true
NOPRESUBMIT=true

Committed:
https://skia.googlesource.com/skia/+/3a2b4d5906625f5178e6da69c1f62ab4e6f275e7
==========

[Stephen White, 2016-02-03 14:38:51]

Committed patchset #1 (id:1) manually as
3a2b4d5906625f5178e6da69c1f62ab4e6f275e7 (presubmit successful).