Add more components to "gn check", work on dom_distiller.

components/rappor/BUILD.gn

Index: components/rappor/BUILD.gn
diff --git a/components/rappor/BUILD.gn b/components/rappor/BUILD.gn
index 7bcc262dc212c460b122f15f9734ed16e1f38e99..badab65f7416d1601128d11ac4ab4fe670cff146 100644
--- a/components/rappor/BUILD.gn
+++ b/components/rappor/BUILD.gn
@@ -32,11 +32,15 @@ source_set("rappor") {
     "sampler.h",
   ]
 
+  public_deps = [
+    "//components/rappor/proto",
+  ]
+
   deps = [
     "//base",
+    "//base:prefs",
     "//components/data_use_measurement/core",
     "//components/metrics",
-    "//components/rappor/proto",
     "//components/variations",
     "//crypto",
     "//net",
@@ -58,7 +62,8 @@ static_library("test_support") {
     ":rappor",
   ]
   deps = [
-    "//components/rappor/proto",
+    "//base",
+    "//base:prefs_test_support",
   ]
 }
 
@@ -77,8 +82,13 @@ source_set("unit_tests") {
 
   deps = [
     ":rappor",
+    ":test_support",
+    "//base",
+    "//base:prefs_test_support",
     "//base/test:test_support",
-    "//components/rappor/proto",
+    "//components/metrics",
+    "//net:test_support",
     "//testing/gtest",
+    "//url",
   ]
 }