Assigning to the concern owner from Find it. Below are the results --
The result is a list of CLs that change the crashed files. 

Author: alancutter
Project: chromium
Changelist: https://chromium.googlesource.com/chromium/src/+/f9262a06c8d1e0478cbf2cc84a1b29f86d9d89e4
Time: Mon Dec 05 05:51:15 2016
Lines 797-798, 1654 of file StyleResolver.cpp which potentially caused crash are changed in this cl (frame #5, "blink::StyleResolver::applyMatchedPropertiesAndCustomPropertyAnimations"; frame #6, "blink::StyleResolver::styleForElement").
Minimum distance from crash line to modified line: 0. (file: StyleResolver.cpp, crashed on: 797, modified: 797).

@alancutter -- Could you please look into the issue, kindly re-assign if this is not related to your changes.
Thank You.

ClusterFuzz has detected this issue as fixed in range 439820:440026.

Detailed report: https://cluster-fuzz.appspot.com/testcase?key=5833719903682560

Fuzzer: inferno_twister
Job Type: linux_ubsan_chrome
Platform Id: linux

Crash Type: Float-cast-overflow
Crash Address: 
Crash State:
  blink::StyleBuilderConverter::convertOffsetRotate
  blink::StyleBuilderFunctions::applyValueCSSPropertyOffsetRotation
  void blink::StyleResolver::applyProperties<
  
Regressed: https://cluster-fuzz.appspot.com/revisions?job=linux_ubsan_chrome&range=435261:438085
Fixed: https://cluster-fuzz.appspot.com/revisions?job=linux_ubsan_chrome&range=439820:440026

Minimized Testcase (0.76 Kb): https://cluster-fuzz.appspot.com/download/AMIfv97-yRh9R7JpNpW37mqL3Yd3BrEqjxx1vB8Ua42mshbaG1HxAMlgoMKOm10WcPeYnrE0FLCbLYCSxnZBC-XhwIP7hZB_p1j5K5MJwe8LLASiLgHro18dj4bwrEJ2GguxnsnaEBtydD7vsjPuzz2cSaWlJHCb8g?testcase_id=5833719903682560

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.

ClusterFuzz testcase 5833719903682560 is verified as fixed, so closing issue.

If this is incorrect, please add ClusterFuzz-Wrong label and re-open the issue.