tree abc2ca8fed2fca64eb63b2c52bfecb916d0ef12e
parent df043ee75cffd64017fd5a571b1e79ee763ea62e
author Zhizhou Yang <zhizhouy@google.com> 1507920133 -0700
committer Zhizhou Yang <zhizhouy@google.com> 1507920133 -0700

Enable PGO for hwui

This patch is trying to apply PGO for hwui. According to some research
on PGO before, we got a 5% to 10% performance improvement with PGO on
hwui and we hope to enable it.

The patch specified a hwui.profdata file, which locates in internal
google_data/pgo_profile directory, to work as the profile to feed PGO.
This profdata can be re-collected through the PGO collecting script in
the benchmark directory, and it was based on hwuimicro/hwuimacro
benchmark for now.

PGO can be turned of by setting ANDROID_PGO_NO_PROFILE_USE environment
variable.

Test: Build hwui successfully and verified the performance improvement
on device through benchmark.
Bug: http://b/63768402

Change-Id: Ib63e5504be34bdfe49f6bc2c52964c30c81f1416