Apply the CTM to the offset in the slow SkOffsetImageFilter path.

Apply the CTM to the offset in the slow SkOffsetImageFilter path.

This was being done in the fast path, but not the slow path.

Since I had to rebaseline the offsetimagefilter GM anyway (to accomodate
the new test case), I added a red border around the intersection
of the (transformed) crop rect and clip rect in each sample, beyond
which no pixels should be drawn.

Chrome bug: https://code.google.com/p/chromium/issues/detail?id=346362

BUG=skia:
R=sugoi@google.com

Committed: https://code.google.com/p/skia/source/detail?r=13656

[Stephen White, 2014-03-04 18:51:32]

sugoi@: PTAL. Thanks!

[sugoi, 2014-03-04 18:56:28]

LGTM with nit:

https://codereview.chromium.org/186643003/diff/20001/gm/offsetimagefilter.cpp
File gm/offsetimagefilter.cpp (right):

https://codereview.chromium.org/186643003/diff/20001/gm/offsetimagefilter.cpp...
gm/offsetimagefilter.cpp:110: drawClippedBitmap(canvas, *bitmap, paint,
SkIntToScalar(1), cropRect);
SK_Scalar1 ?

[Stephen White, 2014-03-04 19:05:00]

On 2014/03/04 18:56:28, sugoi wrote:
> LGTM with nit:
> 
> https://codereview.chromium.org/186643003/diff/20001/gm/offsetimagefilter.cpp
> File gm/offsetimagefilter.cpp (right):
> 
>
https://codereview.chromium.org/186643003/diff/20001/gm/offsetimagefilter.cpp...
> gm/offsetimagefilter.cpp:110: drawClippedBitmap(canvas, *bitmap, paint,
> SkIntToScalar(1), cropRect);
> SK_Scalar1 ?

Done.

[Stephen White, 2014-03-04 19:05:30]

Committed patchset #3 manually as r13656 (presubmit successful).