Roll src/third_party/perfetto 7980e5ea3e34..51516f076308 (4 commits)

https://android.googlesource.com/platform/external/perfetto.git/+log/7980e5ea3e34..51516f076308

git log 7980e5ea3e34..51516f076308 --date=short --no-merges --format='%ad %ae %s'
2019-11-11 fmayer@google.com Merge "Do not count roots as unique_retained."
2019-11-11 rsavitski@google.com Merge "compact_sched: remove "unstable" notices"
2019-11-11 rsavitski@google.com Merge "compact sched_waking: event decoding in trace_processor"
2019-11-11 rsavitski@google.com Merge "compact sched_waking: writer (traced_probes)"

Created with:
  gclient setdep -r src/third_party/perfetto@51516f076308

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: I85e20b4475481af1fd2c2c1eaca3b224e6cbba8e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1910168Reviewed-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@{#714258}

DEPS

@@ -1294,7 +1294,7 @@ deps = {
   },
 
   'src/third_party/perfetto':
-    Var('android_git') + '/platform/external/perfetto.git' + '@' + '7980e5ea3e3474de2c7476b995c3842857d2f749',
+    Var('android_git') + '/platform/external/perfetto.git' + '@' + '51516f076308f8142fd43f911d5e01178017f35d',
 
   'src/third_party/perl': {
       'url': Var('chromium_git') + '/chromium/deps/perl.git' + '@' + '6f3e5028eb65d0b4c5fdd792106ac4c84eee1eb3',