Add COMPONENT: Tools>CodeCoverage

See https://tinyurl.com/yxau5sc4 for context.

Bug: 977050
Change-Id: I30a06cf2cfc7c4a835c1d4094be4a598ab354714
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1808458
Auto-Submit: Eric Foo <efoo@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#698563}

third_party/jacoco/OWNERS

@@ -3,3 +3,5 @@ aluo@chromium.org
 bjoyce@chromium.org
 yliuyliu@google.com
 yzjr@chromium.org
+
+# COMPONENT: Tools>CodeCoverage