Roll src/third_party/perfetto b9ebe017027a..51591a540007 (3 commits)

https://android.googlesource.com/platform/external/perfetto.git/+log/b9ebe017027a..51591a540007

git log b9ebe017027a..51591a540007 --date=short --first-parent --format='%ad %ae %s'
2020-04-15 fmayer@google.com Merge "Protect CPU watchdog against short reads."
2020-04-15 fmayer@google.com Merge "Add heapprofd CPU guardrail."
2020-04-15 fmayer@google.com Merge "Keep cache of abspc -> Frame in HeapTracker."

Created with:
  gclient setdep -r src/third_party/perfetto@51591a540007

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: Iea5c9c89d0a1ab1a8407db3f327272471cec17f6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2151080Reviewed-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@{#759443}

DEPS

@@ -1217,7 +1217,7 @@ deps = {
   },
 
   'src/third_party/perfetto':
-    Var('android_git') + '/platform/external/perfetto.git' + '@' + 'b9ebe017027adf088691e82ee8e17065a92402c7',
+    Var('android_git') + '/platform/external/perfetto.git' + '@' + '51591a540007980695aaa13a28a55bacde51567d',
 
   'src/third_party/perl': {
       'url': Var('chromium_git') + '/chromium/deps/perl.git' + '@' + '6f3e5028eb65d0b4c5fdd792106ac4c84eee1eb3',