Dynamically generate a heading for Extension Docs API pages

chrome/common/extensions/docs/server2/test_data/availability_data_source/test_avail_file_system.json

Index: chrome/common/extensions/docs/server2/test_data/availability_data_source/test_avail_file_system.json
diff --git a/chrome/common/extensions/docs/server2/test_data/availability_data_source/test_avail_file_system.json b/chrome/common/extensions/docs/server2/test_data/availability_data_source/test_avail_file_system.json
new file mode 100644
index 0000000000000000000000000000000000000000..413efae6a68f2f49865f4797f02fd7169490a407
--- /dev/null
+++ b/chrome/common/extensions/docs/server2/test_data/availability_data_source/test_avail_file_system.json
@@ -0,0 +1,80 @@
+{
+  "docs": {
+    "templates": {
+      "json": {
+        "api_availabilities.json": "[{\"name\": \"test\", \"availability\": \"none\"}]",
+        "intro_tables.json": "{\"test\": [{\"Permissions\": \"blue\"}]}"
+      }
+    }
+  },
+  "api": {
+    "_permission_features.json": "{\"alarms\": {\"channel\": \"stable\"}, \"bookmarks\": {\"channel\": \"stable\"}, \"cookies\": {\"channel\": \"dev\"}}",
+    "_manifest_features.json": "{\"runtime\": {\"test\": \"data\"}, \"storage\": {\"test\": \"data\"}}"
+  },
+  "1453": {
+    "api": {
+      "_permission_features.json": "{\"alarms\": {\"channel\": \"stable\"}, \"bookmarks\": {\"channel\": \"stable\"}}",
+      "_manifest_features.json": "{\"runtime\": {\"test\": \"data\"}, \"storage\": {\"test\": \"data\"}}",
+      "tabs.json": "tabs contents",
+      "windows.json": "windows contents"
+    }
+  },
+  "1410": {
+    "api": {
+      "_permission_features.json": "{\"alarms\": {\"channel\": \"stable\"}, \"bookmarks\": {\"channel\": \"stable\"}}",
+      "_manifest_features.json": "{\"runtime\": {\"test\": \"data\"}}",
+      "tabs.json": "tabs contents",
+      "windows.json": "windows contents"
+    }
+  },
+  "1364": {
+    "api": {
+      "_permission_features.json": "{\"alarms\": {\"channel\": \"stable\"}, \"bookmarks\": {\"channel\": \"stable\"}}",
+      "_manifest_features.json": "{\"runtime\": {\"test\": \"data\"}}",
+      "tabs.json": "tabs contents",
+      "windows.json": "windows contents"
+    }
+  },
+  "1312": {
+    "api": {
+      "_permission_features.json": "{\"alarms\": {\"channel\": \"stable\"}, \"bookmarks\": {\"channel\": \"stable\"}}",
+      "_manifest_features.json": "{\"runtime\": {\"test\": \"data\"}}",
+      "tabs.json": "tabs contents",
+      "windows.json": "windows contents"
+    }
+  },
+  "1271": {
+    "api": {
+      "_permission_features.json": "{\"alarms\": {\"channel\": \"beta\"}, \"bookmarks\": {\"channel\": \"stable\"}}",
+      "_manifest_features.json": "{\"runtime\": {\"test\": \"data\"}}",
+      "tabs.json": "tabs contents",
+      "windows.json": "windows contents"
+    }
+  },
+  "1229": {
+    "api": {
+      "_permission_features.json": "{\"bookmarks\": {\"channel\": \"stable\"}}",
+      "_manifest_features.json": "{\"runtime\": {\"test\": \"data\"}}",
+      "tabs.json": "tabs contents"
+    }
+  },
+  "1180": {
+    "api": {
+      "_permission_features.json": "{\"bookmarks\": {\"channel\": \"stable\"}}",
+      "_manifest_features.json": "{\"runtime\": {\"test\": \"data\"}, \"storage\": {\"test\": \"data\"}}",
+      "tabs.json": "tabs contents"
+    }
+  },
+  "1132": {
+    "api": {
+      "_permission_features.json": "{\"contents\": \"null\"}",
+      "_manifest_features.json": "{\"contents\": \"null\"}",
+      "tabs.json": "tabs contents"
+    }
+  },
+  "1084": {
+    "api": {
+      "nothing.json": "nope"
+    }
+  }
+}