Introduce BrowserList and Browser classes for iOS.

ios/clean/chrome/test/BUILD.gn

Index: ios/clean/chrome/test/BUILD.gn
diff --git a/ios/clean/chrome/test/BUILD.gn b/ios/clean/chrome/test/BUILD.gn
index 4ea23caca0f49adb33cd8313644f74d2ab197464..758c428d122e8597c02d0639cfe1e43fc9ebee06 100644
--- a/ios/clean/chrome/test/BUILD.gn
+++ b/ios/clean/chrome/test/BUILD.gn
@@ -2,6 +2,7 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+import("//ios/public/provider/chrome/browser/build_config.gni")
 import("//testing/test.gni")
 
 group("all_tests") {
@@ -13,8 +14,13 @@ group("all_tests") {
 
 test("ios_clean_chrome_unittests") {
   deps = [
+    # Ensure that all unit tests are run, use fake hooks and pack resources.
     "//ios/chrome/test:run_all_unittests",
+    ios_packed_resources_target,
+
+    # Add unit_tests target here.
     "//ios/clean/chrome/browser:unit_tests",
+    "//ios/clean/chrome/browser/model:unit_tests",
     "//ios/clean/chrome/browser/ui/web_contents:unit_tests",
   ]
 }