GN: Some small changes to support chrome android internal stuff

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index 40d9d28beb0574dc5a7c5fe64e82d880f7252e51..e3bf2587d3f46fa5f7d439d84dfe6b1278a2a9a2 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -9,6 +9,9 @@
 # file to your new one or GN won't know about it.
 
 import("//build/config/ui.gni")
+if (is_android) {
+  import("//build/config/android/config.gni")
+}
 
 declare_args() {
   # A list of extra dependencies to add to the root target. This allows a
@@ -188,6 +191,12 @@ group("root") {
       "//third_party/eyesfree:eyesfree_java",
     ]
 
+    if (has_chrome_android_internal) {
+      deps += [
+        "//clank",
+      ]
+    }
+
     deps -= [
       "//apps",  # Needs testing.
       "//chrome/browser",