Merge performance fix for cmsDupToneCurve from previous upstream branch.

Merge performance fix for cmsDupToneCurve from previous upstream branch.

BUG=
R=jun_fang@foxitsoftware.com

Committed: https://pdfium.googlesource.com/pdfium/+/1efeeeb1d9d74dc50e7a62859c1944158e72560e

[palmer, 2014-09-03 18:11:27]

palmer@chromium.org changed reviewers:
+ bo_xu@foxitsoftware.com, jun_fang@foxitsoftware.com

[palmer, 2014-09-03 18:11:28]

Please take a look. Thanks!

Also, what are the other differences between PDFium and other branches in this
directory of the code? We should make sure they are in sync.

[jun_fang, 2014-09-03 18:52:13]

https://codereview.chromium.org/534363002/diff/1/core/src/fxcodec/lcms2/lcms2...
File core/src/fxcodec/lcms2/lcms2-2.6/src/cmsgamma.c (right):

https://codereview.chromium.org/534363002/diff/1/core/src/fxcodec/lcms2/lcms2...
core/src/fxcodec/lcms2/lcms2-2.6/src/cmsgamma.c:825: if (In == NULL || In
->InterpParams == NULL || In ->Segments == NULL || In ->Table16 == NULL) return
NULL;
Seems that these the checking for |In ->Segments == NULL || In -
      >Table16 == NULL| was removed when lcms was upgraded from 2.0 to 2.6. I am
double checking with the author to know its reason.

[jun_fang, 2014-09-04 01:50:28]

On 2014/09/03 18:52:13, jun_fang wrote:
>
https://codereview.chromium.org/534363002/diff/1/core/src/fxcodec/lcms2/lcms2...
> File core/src/fxcodec/lcms2/lcms2-2.6/src/cmsgamma.c (right):
> 
>
https://codereview.chromium.org/534363002/diff/1/core/src/fxcodec/lcms2/lcms2...
> core/src/fxcodec/lcms2/lcms2-2.6/src/cmsgamma.c:825: if (In == NULL || In
> ->InterpParams == NULL || In ->Segments == NULL || In ->Table16 == NULL)
return
> NULL;
> Seems that these the checking for |In ->Segments == NULL || In -
>       >Table16 == NULL| was removed when lcms was upgraded from 2.0 to 2.6. I
am
> double checking with the author to know its reason.

Confirmed with the author, it was removed by mistake. LGTM

[palmer, 2014-09-08 23:10:44]

The CQ bit was checked by palmer@chromium.org

[palmer, 2014-09-08 23:12:01]

The CQ bit was unchecked by palmer@chromium.org

[palmer, 2014-09-08 23:12:16]

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