Add GDB auto-load file to the output directory.

chrome/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/buildflag_header.gni")
 import("//build/config/chrome_build.gni")
 import("//build/config/compiler/compiler.gni")
 import("//build/config/features.gni")
 import("//build/config/locales.gni")
 import("//build/config/sanitizers/sanitizers.gni")
@@ skipping 257 matching lines @@
     if (is_chromeos) {
       deps += [ "//third_party/adobe/flash:flapper_binaries" ]
     }
 
     data_deps += [ "//third_party/widevine/cdm:widevinecdmadapter" ]
 
     if (is_multi_dll_chrome) {
       defines += [ "CHROME_MULTIPLE_DLL" ]
       data_deps += [ ":chrome_child" ]
     }
+
+    data_deps += [ ":gdb_auto_load" ]
   }
 }  # !is_android && !is_mac
 
 if (is_win) {
   # This target is a forwarding target to compile the necessary DLLs used
   # by Chrome.
   group("chrome_dll") {
     data_deps = [
       ":main_dll",
     ]
@@ skipping 1323 matching lines @@
       "//chrome/app/theme/$branding_path_component/product_logo_48.png",
       "//chrome/tools/build/linux/chrome-wrapper",
       "//third_party/xdg-utils/scripts/xdg-mime",
       "//third_party/xdg-utils/scripts/xdg-settings",
     ]
     outputs = [
       "$root_out_dir/{{source_file_part}}",
     ]
   }
 }
+
+# When this auto-load file is installed in the same directory as the Chromium
+# executable, it automatically registers pretty-printers when you start GDB [1].
+#
+# [1] https://sourceware.org/gdb/current/onlinedocs/gdb/Writing-a-Pretty_002dPrinter.html
+copy("gdb_auto_load") {
+  sources = [
+    "//tools/gdb/chrome-gdb.py",
+  ]
+  outputs = [
+    "$root_out_dir/chrome-gdb.py",
+  ]
+}