These are the details for the file, such as they are:
I opened a copy of it with PE-Bear, and found a reference to CoherentGT, version 2.9.5 in this case:
E:\STG\SRC\Tools\CoherentGT_Sources\SRC-2.9.5.0\Coherent\ThirdParty\coherent_webkit\Build\Release\bin64\WTF.pdb
Whatever it is doing, its related to the UI, presumably chosen for its cross platform support: