Roll Perfetto from 8da8bcdf92fb to 81e9301838fc (4 revisions)

https://android.googlesource.com/platform/external/perfetto.git/+log/8da8bcdf92fb..81e9301838fc

2020-11-10 treehugger-gerrit@google.com Merge "Remove idle page checker."
2020-11-10 lalitm@google.com Merge "tp: implement refcounting of packet sequence generations"
2020-11-10 skyostil@google.com Merge "debian: Run tracing service under a dedicated user"
2020-11-10 treehugger-gerrit@google.com Merge "Add trace metric to root cause jank in SysUI CUJs"

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/perfetto-chromium-autoroll
Please CC perfetto-bugs@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/master/autoroll/README.md

Cq-Include-Trybots: luci.chromium.try:linux-perfetto-rel
Bug: None
Tbr: perfetto-bugs@google.com
Change-Id: Icb0a844cdf21fafb49b3c8632bb9e08d04a3f1a2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2529194Reviewed-by: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#825872}

DEPS

@@ -1262,7 +1262,7 @@ deps = {
   },
 
   'src/third_party/perfetto':
-    Var('android_git') + '/platform/external/perfetto.git' + '@' + '8da8bcdf92fba0d2aeaedbc58f6f75775712aaef',
+    Var('android_git') + '/platform/external/perfetto.git' + '@' + '81e9301838fcce3f967c51b92628ea4f7caa4c20',
 
   'src/third_party/perl': {
       'url': Var('chromium_git') + '/chromium/deps/perl.git' + '@' + '6f3e5028eb65d0b4c5fdd792106ac4c84eee1eb3',