Split up ios/web:test_support.

ios/web/test/BUILD.gn

 # Copyright 2016 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("//mojo/public/tools/bindings/mojom.gni")
 import("//tools/grit/grit_rule.gni")
 import("//tools/grit/repack.gni")
 
 mojom("mojo_bindings") {
   sources = [
@@ skipping 28 matching lines @@
   ]
   outputs = [
     "grit/test_resources.h",
     "test_resources.pak",
   ]
   grit_flags = [
     "-E",
     "root_gen_dir=" + rebase_path(root_gen_dir, root_build_dir),
   ]
 }
+
+source_set("test_support") {
+  testonly = true
+
+  deps = [
+    ":test_constants",
+    "//base",
+    "//base/test:test_support",
+    "//ios/web:web",
+    "//ios/web/public/test/fakes",
+    "//ios/web/public/test/http_server",
+    "//testing/gtest",
+    "//third_party/ocmock",
+    "//ui/base",
+  ]
+
+  sources = [
+    "crw_fake_web_controller_observer.h",
+    "crw_fake_web_controller_observer.mm",
+    "test_web_thread.cc",
+    "test_web_thread_bundle.cc",
+    "url_test_util.mm",
+    "web_int_test.h",
+    "web_int_test.mm",
+    "web_test_suite.mm",
+    "web_test_with_web_controller.h",
+    "web_test_with_web_controller.mm",
+    "wk_web_view_crash_utils.h",
+    "wk_web_view_crash_utils.mm",
+  ]
+}
+
+source_set("test_constants") {
+  testonly = true
+  sources = [
+    "test_url_constants.cc",
+    "test_url_constants.h",
+  ]
+}