Lower profiler saver thread priority.

Spotted while looking at bug reports. Doesn't hurt, and better
be safe than sorry.

bug:37446669
bug:36631902
test:manual, looking at bugreports

(cherry picked from commit 23caed84eba735b2615f5962b5161f6dc9e8bd4e)

Change-Id: I47723e368f3a7d863a9ed2e85c223e6e242508d5
1 file changed