This indicates an attack attempt against a Heap Overflow vulnerability in Chrome Skia.
The vulnerability is caused due to incorrect bounds-checking in the application which leads to a heap-based buffer overflow. A remote attacker may be able to exploit this to execute arbitrary code within the context of the application.
Chrome versions before 57.0.2987.98
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor.