tree a2a7b1fc1c8d63f49c04047f3a5b7de8958c171a
parent 22ad33d084c7f28c1196af94d2756b5ba69ed7ff
author haoyuewang <haoyuewang@google.com> 1605721689 -0800
committer Copybara-Service <copybara-worker@google.com> 1605721766 -0800

Add a QuicMemSlice constructor that takes a heap allocated buffer. Advantage:
(1) For small message (e.g., 64 byte ones in time service client), there is no need to use an allocator.
(2) Might make some unit tests easier to write.

PiperOrigin-RevId: 343097958
Change-Id: I5ae41200ef5ba48c89049927e896e423914dfb64