Add perf tests for starting Chrome with URL

tools/perf/page_sets/startup_pages_record.json

Index: tools/perf/page_sets/startup_pages_record.json
diff --git a/tools/perf/page_sets/startup_pages_record.json b/tools/perf/page_sets/startup_pages_record.json
new file mode 100644
index 0000000000000000000000000000000000000000..3ccb750b83eda1b7de19b6b78088ca1bafeb78ed
--- /dev/null
+++ b/tools/perf/page_sets/startup_pages_record.json
@@ -0,0 +1,14 @@
+{
+  "description": "Pages to record data for testing starting Chrome with a URL",

[jeremy, 2013/12/15 13:03:36]

Can you expand this description please, not clear on the difference between this
and startup_pages.json :(

[aberent, 2013/12/16 17:07:43]

Done. Had to turn the description into a list of strings, since JSON
doesn't allow multiline strings. I can't see that the description is read
anywhere in the code, so this should be fine.

+  "archive_data_file": "data/startup_pages.json",
+  "pages": [
+    {
+      "url": "http://news.bbc.co.uk",
+      "why": "typical page"
+    },
+    {
+      "url": "http://kapook.com",
+      "why": "Horribly complex page - stress test!"
+    }
+  ]
+}