Add chrome/browser/ui to the GN build.

ash/BUILD.gn

Index: ash/BUILD.gn
diff --git a/components/history/core/common/BUILD.gn b/ash/BUILD.gn
similarity index 52%
copy from components/history/core/common/BUILD.gn
copy to ash/BUILD.gn
index 7a493141978ebc86786ede32720f563e8a537d74..32f92be168ab45a22ba0f54f406eaa8bd9bde00d 100644
--- a/components/history/core/common/BUILD.gn
+++ b/ash/BUILD.gn
@@ -2,13 +2,11 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-static_library("common") {
-  sources = [
-    "thumbnail_score.cc",
-    "thumbnail_score.h",
-  ]
-
+# TODO(GYP) this is a placeholder so that targets that depend on ash can get
+# the resources generated.
+group("ash") {
   deps = [
-    "//base",
+    "//ash/resources",
+    "//ash/strings",
   ]
 }