Roll src/third_party/perfetto f96bdd640172..8dccfcd7c291 (3 commits)

https://android.googlesource.com/platform/external/perfetto.git/+log/f96bdd640172..8dccfcd7c291

git log f96bdd640172..8dccfcd7c291 --date=short --no-merges --format='%ad %ae %s'
2019-09-27 fmayer@google.com Merge "Re-emit strings if they are used as different types."
2019-09-27 fmayer@google.com Merge "Document exact and start offset."
2019-09-27 lalitm@google.com Merge "trace_processor: add basic cost estimation for db backed tables"

Created with:
  gclient setdep -r src/third_party/perfetto@8dccfcd7c291

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: I30b1da5cfa3526e33d83354fb67639c893f4cb97
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1830212Reviewed-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@{#700950}

DEPS

@@ -1269,7 +1269,7 @@ deps = {
   },
 
   'src/third_party/perfetto':
-    Var('android_git') + '/platform/external/perfetto.git' + '@' + 'f96bdd640172f1cc2b7e505fd883e2caea25c919',
+    Var('android_git') + '/platform/external/perfetto.git' + '@' + '8dccfcd7c2913b622d0cd8245e13203a0671010a',
 
   'src/third_party/perl': {
       'url': Var('chromium_git') + '/chromium/deps/perl.git' + '@' + '6f3e5028eb65d0b4c5fdd792106ac4c84eee1eb3',