[Mac/GN] Set up the component build.

build/secondary/third_party/crashpad/crashpad/handler/BUILD.gn

 # Copyright 2015 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.
 
 source_set("handler_lib") {
   sources = [
     "crash_report_upload_thread.cc",
     "crash_report_upload_thread.h",
     "handler_main.cc",
     "handler_main.h",
@@ skipping 28 matching lines @@
   ]
 
   include_dirs = [ ".." ]
 
   deps = [
     ":handler_lib",
     "../compat",
     "//base",
     "//build/win:default_exe_manifest",
   ]
+
+  if (is_mac && is_component_build) {
+    # The handler is in Chromium.app/Contents/Versions/X/Chromium Framework.framework/Helpers/
+    # so set rpath up to the base.
+    ldflags = [
+      "-rpath",
+      "@loader_path/../../../../../..",
+    ]
+  }
 }