Simplify test locales in Mac's ui_unittests Framework (take 2)

Mac creates a mini-framework in `ui_unittests Framework` so that ui
tests can get a resource bundle without depending on the Chrome
framework.

The way it generated locale information was causing build flakes since
two instances of repack_locales.py could be writing to
out/../gen/repack. Tests always use en-US, so instead just repack the
strings made for ui_test.pak to en.lproj/locale.pak and roll it into the
mini-framework bundle.

Note we can't simply copy ui_test.pak because Mac system libraries will
annoy valgrind with leaks when they encounter unexpected things in it.

BUG=410468, 413034

Review URL: https://codereview.chromium.org/565063002

Cr-Commit-Position: refs/heads/master@{#294774}

ui/base/ui_base_tests_bundle.gypi

@@ -7,8 +7,6 @@
 {
   'product_name': 'ui_unittests Framework',
   'variables': {
-    'grit_out_dir': '<(SHARED_INTERMEDIATE_DIR)/ui',
-
     # There is no executable in the mock framework, and so nothing to strip.
     'mac_strip': 0,
   },
@@ -25,7 +23,9 @@
   'mac_bundle_resources': [
     'test/framework-Info.plist',
     '<(PRODUCT_DIR)/ui_test.pak',
-    '<!@pymod_do_main(repack_locales -o -p <(OS) -g <(grit_out_dir) -s <(SHARED_INTERMEDIATE_DIR) -x <(SHARED_INTERMEDIATE_DIR) <(locales))',
+
+    # Just include the English-US locale made by ui_resources.gyp:ui_test_pak.
+    '<(PRODUCT_DIR)/ui/en.lproj/locale.pak',
   ],
   'mac_bundle_resources!': [
     'test/framework-Info.plist',

ui/resources/BUILD.gn

@@ -52,16 +52,14 @@ if (!is_mac) {
   }
 }
 
-# On iOS the output needs to additionally be copied to another location, so
-# we have this intermediate step.
+# On iOS and Mac the string resources need to go into a locale subfolder, which
+# introduces an extra dependency.
 #
 # GYP version: ui/resources/ui_resources.gyp:ui_test_pak
 #              (copy_ui_test_pak action)
-if (is_ios) {
-  copy("ui_test_pak") {
-    sources = [ "$root_out_dir/ui_test.pak" ]
-    outputs = [ "$root_out_dir/ui/en.lproj/locale.pak" ]
-    deps = [ ":repack_ui_test_pak" ]
+if (is_ios || is_mac) {
+  group("ui_test_pak") {
+    deps = [ ":repack_ui_test_pak", ":repack_ui_test_mac_locale_pack" ]
   }
 } else {
   group("ui_test_pak") {
@@ -92,3 +90,22 @@ repack("repack_ui_test_pak") {
     deps += [ ":copy_ui_resources_100_percent" ]
   }
 }
+
+# Repack just the strings for the framework locales on Mac and iOS. This
+# emulates repack_locales.py, but just for en-US. Note ui_test.pak is not simply
+# copied, because it causes leaks from allocations within system libraries when
+# trying to load non-string resources. http://crbug.com/413034.
+repack("repack_ui_test_mac_locale_pack") {
+  visibility = [ ":ui_test_pak" ]
+
+  sources = [
+    "$root_gen_dir/ui/strings/app_locale_settings_en-US.pak",
+    "$root_gen_dir/ui/strings/ui_strings_en-US.pak",
+  ]
+
+  output = "$root_out_dir/ui/en.lproj/locale.pak"
+
+  deps = [
+    "//ui/strings",
+  ]
+}

ui/resources/ui_resources.gyp

@@ -74,24 +74,24 @@
             },
           ],
         }],
-        ['OS == "ios"', {
+        ['OS == "ios" or OS == "mac"', {
           'actions': [
             {
-              # GN version: //ui/resources:copy_ui_test_pak
-              'action_name': 'copy_ui_test_pak',
-              'message': 'Copying ui_test.pak into locale.pak',
-              'inputs': [
-                '<(PRODUCT_DIR)/ui_test.pak',
-              ],
-              'outputs': [
-                '<(PRODUCT_DIR)/ui/en.lproj/locale.pak',
-              ],
-              'action': [
-                'python',
-                '../../build/cp.py',
-                '<@(_inputs)',
-                '<@(_outputs)'
+              # GN version: //ui/resources:repack_ui_test_mac_locale_pack
+              # Repack just the strings for the framework locales on Mac and
+              # iOS. This emulates repack_locales.py, but just for en-US. Note
+              # ui_test.pak is not simply copied, because it causes leaks from
+              # allocations within system libraries when trying to load non-
+              # string resources. http://crbug.com/413034.
+              'action_name': 'repack_ui_test_mac_locale_pack',
+              'variables': {
+                'pak_inputs': [
+                  '<(SHARED_INTERMEDIATE_DIR)/ui/strings/app_locale_settings_en-US.pak',
+                  '<(SHARED_INTERMEDIATE_DIR)/ui/strings/ui_strings_en-US.pak',
                 ],
+                'pak_output': '<(PRODUCT_DIR)/ui/en.lproj/locale.pak',
+              },
+              'includes': [ '../../build/repack_action.gypi' ],
             },
           ],
         }],