Roll src/third_party/perfetto 7e63268dc86c..638948939287 (3 commits)

https://android.googlesource.com/platform/external/perfetto.git/+log/7e63268dc86c..638948939287

git log 7e63268dc86c..638948939287 --date=short --first-parent --format='%ad %ae %s'
2020-02-19 treehugger-gerrit@google.com Merge "Remove inaccurate information from log."
2020-02-19 taylori@google.com Merge "perfetto-ui: Fix stale heap profile viewing option"
2020-02-19 treehugger-gerrit@google.com Merge "cts: add perf profiler e2e tests for apps"

Created with:
  gclient setdep -r src/third_party/perfetto@638948939287

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

Bug: None
Tbr: perfetto-bugs@google.com
Change-Id: I818ea3073929ad351a9484d7290796dc89fd0a92
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2064434Reviewed-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@{#742755}

DEPS

@@ -1237,7 +1237,7 @@ deps = {
   },
 
   'src/third_party/perfetto':
-    Var('android_git') + '/platform/external/perfetto.git' + '@' + '7e63268dc86c87f06a883e39f671e5006ec0fbdc',
+    Var('android_git') + '/platform/external/perfetto.git' + '@' + '638948939287920b422e1a388fa14ba292b81e06',
 
   'src/third_party/perl': {
       'url': Var('chromium_git') + '/chromium/deps/perl.git' + '@' + '6f3e5028eb65d0b4c5fdd792106ac4c84eee1eb3',