Fix swarming for content_browsertests and browser_tests on site isolation bots.

content/test/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/config/chrome_build.gni")
 import("//build/config/compiler/compiler.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
@@ skipping 658 matching lines @@
         data += [ "$root_out_dir/Content Shell.app/" ]
       }
       if (is_win) {
         if (symbol_level != 0) {
           data += [ "$root_out_dir/content_browsertests.exe.pdb" ]
         }
       }
       if (is_linux) {
         data += [ "//testing/buildbot/filters/browser-side-navigation.linux.content_browsertests.filter" ]
       }
+
+      if (is_win || is_linux) {
+        data += [ "//testing/buildbot/filters/site-per-process.content_browsertests.filter" ]
+      }
     }
   }
 
   defines = [ "HAS_OUT_OF_PROC_TEST_RUNNER" ]
 
   configs += [
     "//build/config:precompiled_headers",
     "//build/config/compiler:no_size_t_to_int_warning",
   ]
 
@@ skipping 972 matching lines @@
   if (is_android) {
     deps += [ "//testing/android/native_test:native_test_native_code" ]
   }
 }
 
 group("fuzzers") {
   deps = [
     "//content/test/fuzzer",
   ]
 }