Divide by 0 in PDF_Interpolate().

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/7b8558259b7a7c4d6ce5fc71a0af1983e8363872

commit 7b8558259b7a7c4d6ce5fc71a0af1983e8363872
Author: thestig <thestig@chromium.org>
Date: Fri May 20 04:30:07 2016

Roll PDFium 8bdb290..8b45eb1

https://pdfium.googlesource.com/pdfium.git/+log/8bdb290..8b45eb1

BUG= 603904 , 613032 , 596528 , 596530 , 603895 , 603903 
TBR=ochang@chromium.org

Review-Url: https://codereview.chromium.org/1997993002
Cr-Commit-Position: refs/heads/master@{#394997}

[modify] https://crrev.com/7b8558259b7a7c4d6ce5fc71a0af1983e8363872/DEPS

ClusterFuzz has detected this issue as fixed in range 394980:395008.

Detailed report: https://cluster-fuzz.appspot.com/testcase?key=4909724834725888

Uploader: ivancic@google.com
Job Type: linux_ubsan_pdfium
Platform Id: linux

Crash Type: UNKNOWN
Crash Address: 
Crash State:
  CPDF_SampledFunc::v_Call
  CPDF_Function::Call
  CPDF_SeparationCS::GetRGB
  
Fixed: https://cluster-fuzz.appspot.com/revisions?job=linux_ubsan_pdfium&range=394980:395008

Minimized Testcase (4.20 Kb): https://cluster-fuzz.appspot.com/download/AMIfv97ovDnRF8p0Prk2teRuhd9rNldaBrOMLKI6U80yRyj1uFxH19t46nAsuHCkWLTWR2t5YaVkDu6r8joT9XdKw0bcPaJAv0izL8CkpDG53vdg72dPJIa0NB3yi6gbNh4RV4vG9BYlFND1SbCI5hq9dKWG_oGWVg

See https://dev.chromium.org/Home/chromium-security/bugs/reproducing-clusterfuzz-bugs for more information.

If you suspect that the result above is incorrect, try re-doing that job on the test case report page.

Removing EditIssue view restrictions from ClusterFuzz filed bugs. If you believe that this issue should still be restricted, please reapply the label.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot