Use bundle_data and create_bundle to add support for iOS app bundle.

base/BUILD.gn

Index: base/BUILD.gn
diff --git a/base/BUILD.gn b/base/BUILD.gn
index 1fcd7189ae63bc7ec7f818af5a13d31953f6e35e..30380c8edee297e13c594e17acaea7874b96b1ff 100644
--- a/base/BUILD.gn
+++ b/base/BUILD.gn
@@ -1620,6 +1620,16 @@ if (is_win) {
   }
 }
 
+bundle_data("base_unittests_bundle_data") {
+  sources = [
+    "test/data",
+  ]
+  outputs = [
+    "{{bundle_resources_dir}}/" +
+        "{{source_root_relative_dir}}/{{source_file_part}}",
+  ]
+}
+
 test("base_unittests") {
   sources = [
     "allocator/tcmalloc_unittest.cc",
@@ -1882,6 +1892,10 @@ test("base_unittests") {
     "//third_party/icu",
   ]
 
+  public_deps = [
+    ":base_unittests_bundle_data",
+  ]
+
   # Some unittests depend on the ALLOCATOR_SHIM macro.
   configs += [ "//base/allocator:allocator_shim_define" ]