Update PDFium OWNERS.

Review-Url: https://codereview.chromium.org/2358363002
diff --git a/OWNERS b/OWNERS
index 47d804b..37876c5 100644
--- a/OWNERS
+++ b/OWNERS
@@ -1,6 +1,13 @@
 brucedawson@chromium.org
+dsinclair@chromium.org
 jam@chromium.org
+npm@chromium.org
 thestig@chromium.org
 tsepez@chromium.org
+weili@chromium.org
+
 # For V8 related changes
 jochen@chromium.org
+
+# For Skia related changes
+caryclark@google.com