Make MB aware of iOS bot configs and get iOS working.

ios/web/BUILD.gn

Index: ios/web/BUILD.gn
diff --git a/ios/web/BUILD.gn b/ios/web/BUILD.gn
index 3701f47e686a023aca3f1aba03928dc4645f0e30..0e5eacd049aa0a18be7cedcd0655f80aee50fea1 100644
--- a/ios/web/BUILD.gn
+++ b/ios/web/BUILD.gn
@@ -2,6 +2,13 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+# GN build of //ios/web only supports building with the web implementation of
+# WebThread as opposed to GYP build that allow using a shim implementation based
+# on top of BrowserThread.
+#
+# See ios/web/ios_web.gyp for more information on how gyp supports this. The
+# gn targets will fold the target selection in the gyp "incomplete" targets.
+
 import("//testing/test.gni")
 import("//ios/web/js_compile.gni")
 
@@ -20,6 +27,9 @@ config("config") {
 
 source_set("web") {
   deps = [
+    ":core",
+    ":js_resources",
+    ":user_agent",
     "//base",
     "//components/url_formatter",
     "//ios/net",
@@ -30,9 +40,6 @@ source_set("web") {
     "//ui/gfx/geometry:geometry",
     "//ui/resources",
     "//url",
-    ":core",
-    ":js_resources",
-    ":user_agent",
   ]
 
   sources = [
@@ -329,6 +336,7 @@ source_set("test_support") {
     "//ios/third_party/gcdwebserver",
     "//testing/gmock",
     "//testing/gtest",
+    "//third_party/google_toolbox_for_mac",
     "//third_party/ocmock",
     ":web",
   ]
@@ -376,14 +384,15 @@ test("ios_web_unittests") {
   deps = [
     "//base",
     "//base/test:test_support",
-    "//ios/testing:ocmock_support",
     "//net:test_support",
     "//testing/gmock",
     "//testing/gtest",
+    "//third_party/google_toolbox_for_mac",
     "//third_party/ocmock",
     "//ui/base:test_support",
-    ":test_support",
+    "//ios/testing:ocmock_support",
     ":web",
+    ":test_support",
   ]
 
   sources = [
@@ -399,7 +408,6 @@ test("ios_web_unittests") {
     "navigation/navigation_item_impl_unittest.mm",
     "navigation/navigation_manager_impl_unittest.mm",
     "navigation/nscoder_util_unittest.mm",
-    "net/cert_host_pair_unittest.cc",
     "net/cert_policy_unittest.cc",
     "net/cert_verifier_block_adapter_unittest.cc",
     "net/clients/crw_csp_network_client_unittest.mm",
@@ -411,6 +419,7 @@ test("ios_web_unittests") {
     "net/request_tracker_impl_unittest.mm",
     "net/web_http_protocol_handler_delegate_unittest.mm",
     "public/referrer_util_unittest.cc",
+    "public/test/http_server_unittest.mm",
     "string_util_unittest.cc",
     "test/crw_fake_web_controller_observer_unittest.mm",
     "test/run_all_unittests.cc",