[Android][gn] Add android resources templates

net/BUILD.gn

Index: net/BUILD.gn
diff --git a/net/BUILD.gn b/net/BUILD.gn
index a77fac24fa3860f738cfa7149711ff6ecbde44ea..dacfad3451596461a92505f6a01e9deaab229293 100644
--- a/net/BUILD.gn
+++ b/net/BUILD.gn
@@ -5,9 +5,15 @@
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
-import("//tools/grit/grit_rule.gni")
 import("//url/config.gni")
 
+# TODO(cjhopman): //build/config/android/rules.gni also imports grit_rule.gni.
+# Currently, that file can't be imported multiple times.  Make this always
+# imported when http://crbug.com/393704 is fixed.
+if (!is_android) {
+  import("//tools/grit/grit_rule.gni")
+}
+
 if (is_android) {
   import("//build/config/android/config.gni")
   import("//build/config/android/rules.gni")