Merge third_party/skia/src from https://chromium.googlesource.com/external/skia/src.git at 1ffcf188ba353bf82876a8d55a127ea6e1dcb27a

This commit was generated by merge_from_chromium.py.

Change-Id: I1bb3256d62017f06f9b6266f5c21e715f807d337