Automatically applying components based on crash stacktrace and information from OWNERS files.

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Automatically adding ccs based on OWNERS file / target commit history.

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Automatically assigning owner based on suspected regression changelist https://chromium.googlesource.com/chromium/src/+/c2a778621cbcd812e2687269ba3f10132a31df12 ([Zucchini] Add dissassembler_dex Fuzzer).

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The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/2d78c3c15a71b517d3ef226010f1cfc4b13e5ea1

commit 2d78c3c15a71b517d3ef226010f1cfc4b13e5ea1
Author: Calder Kitagawa <ckitagawa@chromium.org>
Date: Wed Jul 04 20:44:27 2018

[Zucchini] Enforce valid casts on Rel codes

The MakeWriteRelCodeXX used base::checked_cast which results in a
crash. To fail gracefully we instead use base::CheckedNumeric.

The appearance of this bug results from the input files being bad
resulting in the output from gen also being bad which then propagates
to the apply step.

Bug:  860128 
Change-Id: I38fc91b0a1495ce0c337d778fb51cfe56537e766
Reviewed-on: https://chromium-review.googlesource.com/1126178
Reviewed-by: Samuel Huang <huangs@chromium.org>
Commit-Queue: Calder Kitagawa <ckitagawa@chromium.org>
Cr-Commit-Position: refs/heads/master@{#572648}
[modify] https://crrev.com/2d78c3c15a71b517d3ef226010f1cfc4b13e5ea1/components/zucchini/disassembler_dex.cc

ClusterFuzz has detected this issue as fixed in range 572608:573021.

Detailed report: https://clusterfuzz.com/testcase?key=5720115304464384

Fuzzer: libFuzzer_zucchini_disassembler_dex_fuzzer
Job Type: libfuzzer_chrome_asan_debug
Platform Id: linux

Crash Type: Ill
Crash Address: 0x0000005421ba
Crash State:
  short base::internal::CheckOnFailure::HandleFailure<short>
  short base::internal::checked_cast<short, base::internal::CheckOnFailure, long>
  zucchini::DisassemblerDex::MakeWriteRelCode16
  
Sanitizer: address (ASAN)

Regressed: https://clusterfuzz.com/revisions?job=libfuzzer_chrome_asan_debug&range=572202:572204
Fixed: https://clusterfuzz.com/revisions?job=libfuzzer_chrome_asan_debug&range=572608:573021

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=5720115304464384

See https://chromium.googlesource.com/chromium/src/+/master/testing/libfuzzer/reference.md for more information.

If you suspect that the result above is incorrect, try re-doing that job on the test case report page.

ClusterFuzz testcase 5720115304464384 is verified as fixed, so closing issue as verified.

If this is incorrect, please add ClusterFuzz-Wrong label and re-open the issue.