Roll src/third_party/perfetto 2e43102c54d1..b78fa92a5114 (2 commits)

https://android.googlesource.com/platform/external/perfetto.git/+log/2e43102c54d1..b78fa92a5114

git log 2e43102c54d1..b78fa92a5114 --date=short --no-merges --format='%ad %ae %s'
2019-10-18 lalitm@google.com trace_processor: fix starting on the correct bit for set bits iter
2019-10-18 lalitm@google.com Merge "trace_processor: use packet ts if power rail ts is empty"

Created with:
  gclient setdep -r src/third_party/perfetto@b78fa92a5114

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: chromium:135177627
Change-Id: I8ae77dab22fe869b36e5cf06554f875f84731315
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1868978Reviewed-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@{#707434}

DEPS

@@ -1280,7 +1280,7 @@ deps = {
   },
 
   'src/third_party/perfetto':
-    Var('android_git') + '/platform/external/perfetto.git' + '@' + '2e43102c54d1b719d93781e78db05bdde572a509',
+    Var('android_git') + '/platform/external/perfetto.git' + '@' + 'b78fa92a51140e60da2c3657c28efa26a7fbfda1',
 
   'src/third_party/perl': {
       'url': Var('chromium_git') + '/chromium/deps/perl.git' + '@' + '6f3e5028eb65d0b4c5fdd792106ac4c84eee1eb3',