[iOS] Define bundle_data target for //ui unittests

ui/gfx/BUILD.gn

Index: ui/gfx/BUILD.gn
diff --git a/ui/gfx/BUILD.gn b/ui/gfx/BUILD.gn
index 7115ef211386d1aed8ee369ef5a29f4268148ce3..8d5c1f31fe655d1966f2d968fb4aa9e529ce52a7 100644
--- a/ui/gfx/BUILD.gn
+++ b/ui/gfx/BUILD.gn
@@ -636,6 +636,16 @@ source_set("test_support") {
   }
 }
 
+bundle_data("gfx_unittests_bundle_data") {
+  sources = [
+    "test/data",

[Dirk Pranke, 2016/03/16 22:06:05]

nit: trailing slash

[sdefresne, 2016/03/17 09:37:19]

No, adding a trailing slash will cause an error as sources needs to be converted
to SourceFile (the gn object representing a path to a source file). This errors
out if the path ends with a trailing slash saying that you cannot reference a
directory.

So, here we list the directory as a single file. This means that if the content
of the directory change, then the bundle_data may be incorrect. This was
discussed when I created the design for bundles, and the decision was that for
tests we were okay with having dependencies a bit stale as generally adding a
new test data will go in sync with new source change, and cause the target to be
rebuilt (as the create_bundle target transitively depends on the same target as
the executable target).

+  ]
+  outputs = [
+    "{{bundle_resources_dir}}/" +
+        "{{source_root_relative_dir}}/{{source_file_part}}",
+  ]
+}
+
 test("gfx_unittests") {
   sources = [
     "font_render_params_linux_unittest.cc",
@@ -719,6 +729,7 @@ test("gfx_unittests") {
 
   deps = [
     ":gfx",
+    ":gfx_unittests_bundle_data",
     ":test_support",
     "//base",
     "//base/test:test_support",