Make output placeholders like json.output index-able by name.

recipe_modules/raw_io/example.expected/basic.json

Index: recipe_modules/raw_io/example.expected/basic.json
diff --git a/recipe_modules/raw_io/example.expected/basic.json b/recipe_modules/raw_io/example.expected/basic.json
index 239a08218ecc2b7243d30e97f8071b625bbe2755..d843c2d30d75b4e22e8d5327b032b22b6edd555b 100644
--- a/recipe_modules/raw_io/example.expected/basic.json
+++ b/recipe_modules/raw_io/example.expected/basic.json
@@ -64,6 +64,23 @@
     "name": "leak dir"
   },
   {
+    "cmd": [
+      "python",
+      "-u",
+      "\nimport sys\nwith open(sys.argv[1], 'w') as f:\n  f.write('bad_value')\n",
+      "/path/to/tmp/"
+    ],
+    "cwd": "[SLAVE_BUILD]",
+    "name": "override_default_mock",
+    "~followup_annotations": [
+      "@@@STEP_LOG_LINE@python.inline@@@@",
+      "@@@STEP_LOG_LINE@python.inline@import sys@@@",
+      "@@@STEP_LOG_LINE@python.inline@with open(sys.argv[1], 'w') as f:@@@",
+      "@@@STEP_LOG_LINE@python.inline@  f.write('bad_value')@@@",
+      "@@@STEP_LOG_END@python.inline@@@"
+    ]
+  },
+  {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0