Probably C++. A quick Google Code Search on the Chromium project reveals files like this one: http://codesearch.google.com/codesearch/p?hl=en#OAMlx_jo-ck/src/th

Probably C++. A quick Google Code Search on the Chromium project reveals files like this one: http://codesearch.google.com/codesearch/p?hl=en#OAMlx_jo-ck/src/third_party/skia/include/pdf/SkPDFDevice.h&q=pdf&exact_package=chromium&sa=N&cd=7&ct=rc http://codesearch.google.com/codesearch/p?hl=en#OAMlx_jo-ck/... I'm not 100% sure that's relevant code to the discussion at hand, but it seems likely.