Roll Perfetto from e1502e7972cb to 48b2aad780bf (6 revisions)

https://android.googlesource.com/platform/external/perfetto.git/+log/e1502e7972cb..48b2aad780bf

2020-12-07 lalitm@google.com Merge "perfetto_cmd: remove reference to legacy dropbox"
2020-12-07 eseckler@google.com Merge "Add json_agent_label_filter to chrome_config proto configuration."
2020-12-07 primiano@google.com Merge "GN: Add standalone build rules for Windows"
2020-12-07 lalitm@google.com Merge "ui: improve perf of query for CPU stack samples"
2020-12-07 eseckler@google.com Merge "processor: Fix memory leak in MemoryTrackerSnapshotParser"
2020-12-07 lalitm@google.com Merge "Add new dynamic table to look up ancestors of CPU stack samples."

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: None
Tbr: perfetto-bugs@google.com
Change-Id: Ic3baf8c291f643144cad59ddf3d5663e3a0e9eaf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2575762Reviewed-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@{#834337}

DEPS

@@ -1290,7 +1290,7 @@ deps = {
   },
 
   'src/third_party/perfetto':
-    Var('android_git') + '/platform/external/perfetto.git' + '@' + 'e1502e7972cb2a4bb582d5ae2cc693cc3b7868dc',
+    Var('android_git') + '/platform/external/perfetto.git' + '@' + '48b2aad780bfff59c2cd1a1169cedc68816a017b',
 
   'src/third_party/perl': {
       'url': Var('chromium_git') + '/chromium/deps/perl.git' + '@' + '6f3e5028eb65d0b4c5fdd792106ac4c84eee1eb3',