Roll src/third_party/perfetto a20a50c6f2c7..fa20b7a3bd3c (3 commits)

https://android.googlesource.com/platform/external/perfetto.git/+log/a20a50c6f2c7..fa20b7a3bd3c


git log a20a50c6f2c7..fa20b7a3bd3c --date=short --no-merges --format='%ad %ae %s'
2018-10-22 fmayer@google.com Merge "profiling: Add tool to verify sampling strategies."
2018-10-22 primiano@google.com Merge "Docs: Fix links"
2018-10-22 primiano@google.com Infra: update perfetto site to mirror github pages


Created with:
  gclient setdep -r src/third_party/perfetto@fa20b7a3bd3c

The AutoRoll server is located here: https://autoroll.skia.org/r/perfetto-chromium-autoroll

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, please contact the current sheriff, who should
be CC'd on the roll, and stop the roller if necessary.


TBR=perfetto-bugs@google.com

Change-Id: Ifbb79f2bd812ae9d9ae76bc18e2abe989a76984f
Reviewed-on: https://chromium-review.googlesource.com/c/1292260Reviewed-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@{#601566}

DEPS

@@ -1004,7 +1004,7 @@ deps = {
   },
 
   'src/third_party/perfetto':
-    Var('android_git') + '/platform/external/perfetto.git' + '@' +  'a20a50c6f2c7a7ffe305a3f8de340ef8fddbc3ed',
+    Var('android_git') + '/platform/external/perfetto.git' + '@' +  'fa20b7a3bd3c6f3bb677959e8bc3af91b2d7da9f',
 
   'src/third_party/perl': {
       'url': Var('chromium_git') + '/chromium/deps/perl.git' + '@' + 'ac0d98b5cee6c024b0cffeb4f8f45b6fc5ccdb78',