Roll Perfetto from 16c50deb5eb4 to a307488e3859 (5 revisions)

https://android.googlesource.com/platform/external/perfetto.git/+log/16c50deb5eb4..a307488e3859

2020-07-29 treehugger-gerrit@google.com Merge "Added support for importing v2 flow events from json"
2020-07-29 treehugger-gerrit@google.com Merge "Added support for importing v1 flow events from json"
2020-07-29 treehugger-gerrit@google.com Merge "Add new metric for queuing delay scroll jank cause."
2020-07-29 treehugger-gerrit@google.com Merge "Add NOLINT for FDs that we do not want to be CLOEXEC."
2020-07-29 primiano@google.com Merge "GN: don't run linux_find_llvm.py when is_system_compiler=true"

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: I0da034ccf671598feced50880021fe971127c350
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2326289Reviewed-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@{#792803}

DEPS

@@ -1248,7 +1248,7 @@ deps = {
   },
 
   'src/third_party/perfetto':
-    Var('android_git') + '/platform/external/perfetto.git' + '@' + '16c50deb5eb4c163a18666986ee9e28bf735e1a9',
+    Var('android_git') + '/platform/external/perfetto.git' + '@' + 'a307488e3859710bb6d71f0b1462fdcb2b2da4d2',
 
   'src/third_party/perl': {
       'url': Var('chromium_git') + '/chromium/deps/perl.git' + '@' + '6f3e5028eb65d0b4c5fdd792106ac4c84eee1eb3',