Roll Perfetto from 273da44ed986 to 7835859ea8de (2 revisions)

https://android.googlesource.com/platform/external/perfetto.git/+log/273da44ed986..7835859ea8de

2020-06-04 lalitm@google.com tp: rename SparseVector -> NullableVector
2020-06-04 fmayer@google.com Ingest heap graphs in a more streaming fashion.

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: chromium:157210785
Tbr: perfetto-bugs@google.com
Change-Id: I95b609d087ed896813533ffd64035d13dd467349
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2231025Reviewed-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@{#775213}

DEPS

@@ -1224,7 +1224,7 @@ deps = {
   },
 
   'src/third_party/perfetto':
-    Var('android_git') + '/platform/external/perfetto.git' + '@' + '273da44ed98694de9ef802b7c8d62267d042eb40',
+    Var('android_git') + '/platform/external/perfetto.git' + '@' + '7835859ea8de36fcb15ab8c0f31126fc9c6a3d0f',
 
   'src/third_party/perl': {
       'url': Var('chromium_git') + '/chromium/deps/perl.git' + '@' + '6f3e5028eb65d0b4c5fdd792106ac4c84eee1eb3',