[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 9be71bcb5e81da2db80e436c59594880a00b9a90..ebbfbecd0fba304e0062d9fad627f00f92f80aee 100644
--- a/build/config/mac/rules.gni
+++ b/build/config/mac/rules.gni
@@ -209,6 +209,9 @@ 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.
@@ -249,6 +252,9 @@ 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"
   }