OWNERS: restrict core/important subdirs to domain experts

Changes to these subdirs are infrequent enough that we can reasonably
restrict approval to general ebuild/eclass experts.

BUG=None
TEST=None

Change-Id: I36d0de85a02b0502431a5c5a424ca4144d9bc1e1
Reviewed-on: https://chromium-review.googlesource.com/1661090
Tested-by: Mike Frysinger <vapier@chromium.org>
Commit-Ready: Mike Frysinger <vapier@chromium.org>
Legacy-Commit-Queue: Commit Bot <commit-bot@chromium.org>
Reviewed-by: Chris McDonald <cjmcdonald@chromium.org>
diff --git a/OWNERS b/OWNERS
index 352770a..5f0a65b 100644
--- a/OWNERS
+++ b/OWNERS
@@ -1,7 +1,5 @@
+# By default everyone may approve.
 *
-allenwebb@google.com
-bmgordon@chromium.org
-chirantan@chromium.org
-cjmcdonald@chromium.org
-manojgupta@chromium.org
-vapier@chromium.org
+
+# Set of domain experts available for consultation as a fallback.
+include OWNERS.general
diff --git a/OWNERS.general b/OWNERS.general
new file mode 100644
index 0000000..774144b
--- /dev/null
+++ b/OWNERS.general
@@ -0,0 +1,7 @@
+# Ebuild/eclass experts!
+allenwebb@google.com
+bmgordon@chromium.org
+chirantan@chromium.org
+manojgupta@chromium.org
+
+include chromiumos/chromite:OWNERS.build
diff --git a/eclass/OWNERS b/eclass/OWNERS
index c68382c..fa00de3 100644
--- a/eclass/OWNERS
+++ b/eclass/OWNERS
@@ -1,7 +1,5 @@
 set noparent
 
-cjmcdonald@chromium.org
-lamontjones@chromium.org
-nednguyen@google.com
-saklein@chromium.org
-vapier@chromium.org
+include ../OWNERS.general
+
+# COMPONENT: Infra>ChromeOS>Build>Platform
diff --git a/licenses/OWNERS b/licenses/OWNERS
new file mode 100644
index 0000000..fa00de3
--- /dev/null
+++ b/licenses/OWNERS
@@ -0,0 +1,5 @@
+set noparent
+
+include ../OWNERS.general
+
+# COMPONENT: Infra>ChromeOS>Build>Platform
diff --git a/metadata/OWNERS b/metadata/OWNERS
new file mode 100644
index 0000000..fa00de3
--- /dev/null
+++ b/metadata/OWNERS
@@ -0,0 +1,5 @@
+set noparent
+
+include ../OWNERS.general
+
+# COMPONENT: Infra>ChromeOS>Build>Platform
diff --git a/profiles/OWNERS b/profiles/OWNERS
new file mode 100644
index 0000000..fa00de3
--- /dev/null
+++ b/profiles/OWNERS
@@ -0,0 +1,5 @@
+set noparent
+
+include ../OWNERS.general
+
+# COMPONENT: Infra>ChromeOS>Build>Platform