Merge third_party/sfntly/cpp/src from https://chromium.googlesource.com/external/sfntly/cpp/src.git at 1bdaae8fc788a5ac8936d68bf24f37d977a13dac

This commit was generated by merge_from_chromium.py.

Change-Id: I28e046f822d81a0fb100e1e250dc9649fed0e671