Roll src/third_party/perfetto 50dc0de928ba..8dda56311c7d (2 commits)

https://android.googlesource.com/platform/external/perfetto.git/+log/50dc0de928ba..8dda56311c7d

git log 50dc0de928ba..8dda56311c7d --date=short --no-merges --format='%ad %ae %s'
2019-10-14 fmayer@google.com Merge "Minor heapprofd doc improvements."
2019-10-14 treehugger-gerrit@google.com Merge "Remove usage of 'awk ${print 2}' from webUSB control."

Created with:
  gclient setdep -r src/third_party/perfetto@8dda56311c7d

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

TBR=perfetto-bugs@google.com

Bug: None
Change-Id: Ib09ce18b9d62236a6ade9c35d31436b93b1f5afa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1860494Reviewed-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@{#705627}

DEPS

@@ -1280,7 +1280,7 @@ deps = {
   },
 
   'src/third_party/perfetto':
-    Var('android_git') + '/platform/external/perfetto.git' + '@' + '50dc0de928ba088faebb821ef949ba3772fe8d13',
+    Var('android_git') + '/platform/external/perfetto.git' + '@' + '8dda56311c7ded002f01dcb15bfe5310888ff5b8',
 
   'src/third_party/perl': {
       'url': Var('chromium_git') + '/chromium/deps/perl.git' + '@' + '6f3e5028eb65d0b4c5fdd792106ac4c84eee1eb3',