Roll Perfetto from 9b8970cc0198 to 3b50b7c41123 (1 revision)

https://android.googlesource.com/platform/external/perfetto.git/+log/9b8970cc0198..3b50b7c41123

2020-10-02 treehugger-gerrit@google.com Merge "Optimize the scroll_jank_cause_queuing_delay metric."

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: If61bf5f9f0e2c1f5b2c7c4263b730901ec844b15
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2446911Reviewed-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@{#813442}

DEPS

@@ -1254,7 +1254,7 @@ deps = {
   },
 
   'src/third_party/perfetto':
-    Var('android_git') + '/platform/external/perfetto.git' + '@' + '9b8970cc01987fdaa9b88bb1c8543b1dbb683f72',
+    Var('android_git') + '/platform/external/perfetto.git' + '@' + '3b50b7c41123f7e675aa8f966687b3bbcc9b687a',
 
   'src/third_party/perl': {
       'url': Var('chromium_git') + '/chromium/deps/perl.git' + '@' + '6f3e5028eb65d0b4c5fdd792106ac4c84eee1eb3',