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 cfe258bae5d2e56972efc4e78f3f57cb6e46eb18..73035ffd675ab8294ab92713e2edf4464ffcb5d3 100644
--- a/base/BUILD.gn
+++ b/base/BUILD.gn
@@ -1620,6 +1620,17 @@ if (is_win) {
   }
 }
 
+if (is_ios) {
+  bundle_data("base_unittests_bundle_data") {

[brettw, 2016/03/15 18:02:29]

Can bundles be set up in such a way that we don't need the conditional on each
one? If there's no create_bundle target that uses them, I think this would be
benign.

But in this case if we want iOS but not desktop Mac bundle data, we would still
need the conditional.

[sdefresne, 2016/03/16 09:58:49]

Removed the conditional (since Mac does not currently uses create_bundle this
does not cause any problem currently).

+    sources = [
+      "test/data",
+    ]
+    outputs = [
+      "{{bundle_resources_dir}}/{{source_root_relative_dir}}/{{source_file_part}}",
+    ]
+  }
+}
+
 test("base_unittests") {
   sources = [
     "allocator/tcmalloc_unittest.cc",
@@ -1881,6 +1892,10 @@ test("base_unittests") {
     "//third_party/icu",
   ]
 
+  if (is_ios) {
+    deps += [ ":base_unittests_bundle_data" ]
+  }
+
   # Some unittests depend on the ALLOCATOR_SHIM macro.
   configs += [ "//base/allocator:allocator_shim_define" ]