[Mac/GN] Implement dSYM generation and stripping.

build/config/mac/rules.gni

Index: build/config/mac/rules.gni
diff --git a/build/config/mac/rules.gni b/build/config/mac/rules.gni
index 40e221b7fa0aa279d9226b2b28f8e6c34a707bfb..651f26312015d69090b2ff15ca778c2c423c31b0 100644
--- a/build/config/mac/rules.gni
+++ b/build/config/mac/rules.gni
@@ -214,6 +214,9 @@ template("mac_framework_bundle") {
 #         (optional) list of label, additional configs to apply to the
 #         executable target.
 #
+#     remove_configs:
+#         (optional) list of label, default configs to remove from the target.
+#
 #     extra_substitutions:
 #         (optional) string array, 'key=value' pairs for extra fields which are
 #         specified in a source Info.plist template.
@@ -254,6 +257,9 @@ template("mac_app_bundle") {
     if (defined(extra_configs)) {
       configs += extra_configs
     }
+    if (defined(remove_configs)) {
+      configs -= remove_configs
+    }
     output_name = _output_name
     output_dir = "$target_out_dir/$_executable_target"
   }