Merge third_party/skia/gyp from https://chromium.googlesource.com/external/skia/gyp.git at 5412de1e1fa9bef72ad1ae793f09273c236707c9

This commit was generated by merge_from_chromium.py.

Change-Id: If99d5a454f5a85b9cdd9405d4899ac47dc6e69d7