Add more GN deps to the build.

chrome/app/BUILD.gn

Index: chrome/app/BUILD.gn
diff --git a/chrome/app/BUILD.gn b/chrome/app/BUILD.gn
index 2addc7ba045966075b096f07efc74f85d28cd55e..9ff5c084652ad0f47f6a393ddccba5982b1650a3 100644
--- a/chrome/app/BUILD.gn
+++ b/chrome/app/BUILD.gn
@@ -10,6 +10,29 @@ grit("generated_resources") {
   source = "generated_resources.grd"
 }
 
+# GYP version: chrome/chrome_resources.gyp:chrome_strings_map
+action("make_generated_resources_map") {
+  # Targets should depend on generated_resources_map instead.
+  visibility = ":generated_resources_map"
+
+  script = "//chrome/browser/metrics/variations/generate_resources_map.py"
+
+  source_prereqs = [ "$target_gen_dir/grit/generated_resources.h" ]
+  outputs = [ "$target_gen_dir/generated_resources_map.cc" ]
+
+  args = rebase_path(source_prereqs, root_build_dir) +
+      rebase_path(outputs, root_build_dir)
+
+  deps = [ ":generated_resources" ]
+}
+
+# Collect the generated .cc file from make_generated_resources_map and put it
+# in a source set so targets that depend on it will link the source rather than
+# specifying it manually. This doesn't happen in the GYP build.
+source_set("generated_resources_map") {
+  sources = get_target_outputs(":make_generated_resources_map")
+}
+
 # GYP version: chrome/chrome_resources.gyp:chrome_strings
 #              (generate_google_chrome_strings action)
 grit("google_chrome_strings") {