Merge third_party/skia/gyp from https://chromium.googlesource.com/external/skia/gyp.git at ca4311e9500734c101a5d63666fe1a0fbca2c630

This commit was generated by merge_from_chromium.py.

Change-Id: I9978d4ac74c94c34366cd89476a59756b5c6a567