Merge third_party/sfntly/cpp/src from https://chromium.googlesource.com/external/sfntly/cpp/src.git at 8f090032dd4f8f8908f338cc73bb840b788377f2

This commit was generated by merge_from_chromium.py.

Change-Id: I6bab7aea653201e125014f7b81504acf7b846300