Add systrace logging to ScopedCodeCacheWrite

Shows if we are taking a long time to mprotect.

Bug: 27502458

(cherry picked from commit 462cd2cfa8c5fbb6548419eb8f27b448a12aca11)

Change-Id: Ic0f24641f5856b13f3b949dcd53dc01ec952d171
1 file changed