Roll src/third_party/perfetto 56731e642bb7..a4b8c86e94ba (1 commits)

https://android.googlesource.com/platform/external/perfetto.git/+log/56731e642bb7..a4b8c86e94ba

git log 56731e642bb7..a4b8c86e94ba --date=short --first-parent --format='%ad %ae %s'
2020-02-27 lalitm@google.com tp: add missing systrace comment

Created with:
  gclient setdep -r src/third_party/perfetto@a4b8c86e94ba

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/+/master/autoroll/README.md

Bug: None
Tbr: perfetto-bugs@google.com
Change-Id: I4c4e871f5e32e4b977f067b85c4a6325bb112d6f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2078295Reviewed-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@{#745097}

DEPS

@@ -1230,7 +1230,7 @@ deps = {
   },
 
   'src/third_party/perfetto':
-    Var('android_git') + '/platform/external/perfetto.git' + '@' + '56731e642bb77a0edbf1dbdde9d3c5d21f193d98',
+    Var('android_git') + '/platform/external/perfetto.git' + '@' + 'a4b8c86e94ba29dcdacbf2c14dc0c8f4801547a1',
 
   'src/third_party/perl': {
       'url': Var('chromium_git') + '/chromium/deps/perl.git' + '@' + '6f3e5028eb65d0b4c5fdd792106ac4c84eee1eb3',