classifyContent should skip computing resource ID from virtual file path if src.family is set
Normally, the classifyContent method will compute the resource ID for each file from the path property and assign the resource ID coordinates to the src property. This assumes that the classifyContent is receiving a file from the content aggregate. However, it's possible that an extension will add the file with a precomputed resource ID to the aggregate. The classifyContent function should detect this case and bypass the redundant logic to compute the resource ID from the path property. The criterion it should use to determine if the resource ID is already computed is if the src.family property is set.