Add build/fuchsia/OWNERS and use it in wildcards in some OWNERS files.

As more of Chromium is ported to Fuchsia, per-directory OWNERS files can
link back to the master build/fuchsia/OWNERS to manage Fuchsia-specific
file ownership more easily.

Change-Id: Ic8cc48b681b361fc280c793a0361aebefea860cd
Reviewed-on: https://chromium-review.googlesource.com/569501
Commit-Queue: Wez <wez@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: danakj <danakj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#486576}

base/OWNERS

@@ -32,6 +32,9 @@ per-file callback*=tzik@chromium.org
 per-file *android*=file://base/android/OWNERS
 per-file BUILD.gn=file://base/android/OWNERS
 
+# For Fuchsia-specific changes:
+per-file *_fuchsia*=file://build/fuchsia/OWNERS
+
 # For FeatureList API:
 per-file feature_list*=asvitkine@chromium.org
 per-file feature_list*=isherman@chromium.org

build/fuchsia/OWNERS

+jamesr@chromium.org
+kmarshall@chromium.org
+scottmg@chromium.org
+sergeyu@chromium.org
+thakis@chromium.org
+wez@chromium.org
+
+# TEAM: cr-fuchsia@chromium.org
+# COMPONENT: Internals>PlatformIntegration

testing/buildbot/filters/OWNERS

@@ -10,11 +10,7 @@ per-file browser-side-navigation*=nasko@chromium.org
 per-file browser-side-navigation*=scottmg@chromium.org
 per-file browser-side-navigation*=yzshen@chromium.org
 
-per-file fuchsia*=jamesr@chromium.org
-per-file fuchsia*=kmarshall@chromium.org
-per-file fuchsia*=scottmg@chromium.org
-per-file fuchsia*=sergeyu@chromium.org
-per-file fuchsia*=wez@chromium.org
+per-file fuchsia*=file://build/fuchsia/OWNERS
 
 # TEAM: infra-dev@chromium.org
 # COMPONENT: Infra>Client>Chrome