Merge third_party/mesa/src from https://chromium.googlesource.com/chromium/deps/mesa.git at 3f79f50967bbf4fdaba7507a8d1526aa24eefd91

This commit was generated by merge_from_chromium.py.

Change-Id: I872dc772b10b6bf7fb41bc2f4ff8f66116f2ce88