commit eb30829215e18d83b183203cbe10a956fada75db
author Adenilson Cavalcanti <adenilson.cavalcanti@arm.com> Wed May 15 18:41:47 2019
committer Commit Bot <commit-bot@chromium.org> Wed May 15 18:41:47 2019
tree 66b9ce62d28f4f8488f78538f47b5c1964b5383c
parent 3d9041cb4790eb3a15d3843a3a047e02a4a2a5bd

Adding FastHash() function

The objective is to provide a fast and high quality hash for general
use that will exploit the hardware features of the running CPU.

It is warranted to be high quality and top speed, but it is prone
to be updated when a newer/faster hash function is publicly available.

There are *no warranties* that the hash generated will be the same on
all CPUs (e.g. ARM x Intel) or build target (e.g. 32-bit vs 64-bit).
For such cases, use PersistentHash() instead.

It is also a non-cryptographic hash, therefore, use it when speed
is most important.

For now, it is powered by the latest version of CityHash on both
ARM/Intel and is the same version (i.e. City32() x City64())
depending on now Chromium was built (32-bit app or 64-bit).

Plus migrate server-side *independent* client code to use base::FastHash
that was using deprecated CityHash.

Bug: 902789
Change-Id: If38169b8f3a7f22f667efef8576fb28b3130d644
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1575082
Reviewed-by: Adenilson Cavalcanti <cavalcantii@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Reviewed-by: Emil A Eklund <eae@chromium.org>
Commit-Queue: Adenilson Cavalcanti <cavalcantii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#660041}