Roll external/skia 06775d451..d5bee5d50 (4 commits)

https://skia.googlesource.com/skia.git/+log/06775d451..d5bee5d50

2017-06-01 reed@google.com add API to change max pointsize for font cache
2017-06-01 recipe-roller@chromium.org Roll recipe dependencies (trivial).
2017-06-01 robertphillips@google.com Rm int flavor of GrNextPow2 in favor of uint32_t flavor
2017-06-01 kjlubick@google.com Use ssh to trigger chromecast test

Test: Presubmit checks will test this change.
Change-Id: I2b23b6bbad94e40ff3508270eb5e4c0a672cb2db