28100 [UWP] Add all mouse buttons support (cla: yes, waiting for tree to go green, platform-windows, needs tests)

28101 Roll Skia from b1f34bf3c2cb to 6b9c7bb81419 (1 revision) (cla: yes, waiting for tree to go green)

28102 Roll Skia from 6b9c7bb81419 to fc3bee1232fa (1 revision) (cla: yes, waiting for tree to go green)

28103 Roll Skia from fc3bee1232fa to 7b2af606d352 (1 revision) (cla: yes, waiting for tree to go green)