Add isolate for content_browsertests with --site-per-process.

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/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//build_overrides/v8.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
@@ skipping 321 matching lines @@
     ]
   }
 
   android_resources("content_browsertests_resources") {
     testonly = true
     resource_dirs = [ "//content/shell/android/browsertests_apk/res" ]
     custom_package = "org.chromium.content_browsertests_apk"
   }
 }
 
+# TODO(GYP): Delete this after we've converted everything to GN.
+# The _run targets exist only for compatibility w/ GYP.
+group("content_site_isolation_browsertests_run") {
+  testonly = true
+  deps = [
+    ":content_browsertests",
+  ]
+}
+
+group("content_site_isolation_browsertests") {
+  testonly = true
+  data = [
+    "//testing/buildbot/filters/site-per-process.content_browsertests.filter",
+  ]
+  data_deps = [
+    ":content_browsertests",
+  ]
+}
+
 test("content_browsertests") {
   sources = rebase_path(content_tests_gypi_values.content_browsertests_sources,
                         ".",
                         "//content")
 
   if (is_android || is_linux || is_mac || is_win) {
     data = [
       "$root_out_dir/content_shell.pak",
       "data/",
       "//net/data/",
@@ skipping 547 matching lines @@
       deps += [
         "//gpu:test_support",
         "//media/base/android",
         "//media/base/android:media_java",
         "//testing/gmock",
         "//ui/android:ui_java",
       ]
     }
   }
 }