Port PerfWarm startup test to Telemetry

tools/perf/page_sets/blank_25.json

+{
+    "description": "25 blank pages",
+    "pages": [

[nduca, 2013/03/12 18:47:41]

i think marja added a repeat option. Can we accomplish this with that?

[jeremy, 2013/03/13 08:16:53]

Yep, much better option - done.

+        {
+            "url": "file:///blank_page/blank_page.html"

[nduca, 2013/03/12 18:47:41]

dont we have a page_sets/blank.html lying around? I dont think it needs to be in
its own directory...

[jeremy, 2013/03/13 08:16:53]

Done, If we have one already I haven't found it.

+        },
+        {
+            "url": "file:///blank_page/blank_page.html"
+        },
+        {
+            "url": "file:///blank_page/blank_page.html"
+        },
+        {
+            "url": "file:///blank_page/blank_page.html"
+        },
+        {
+            "url": "file:///blank_page/blank_page.html"
+        },
+        {
+            "url": "file:///blank_page/blank_page.html"
+        },
+        {
+            "url": "file:///blank_page/blank_page.html"
+        },
+        {
+            "url": "file:///blank_page/blank_page.html"
+        },
+        {
+            "url": "file:///blank_page/blank_page.html"
+        },
+        {
+            "url": "file:///blank_page/blank_page.html"
+        },
+        {
+            "url": "file:///blank_page/blank_page.html"
+        },
+        {
+            "url": "file:///blank_page/blank_page.html"
+        },
+        {
+            "url": "file:///blank_page/blank_page.html"
+        },
+        {
+            "url": "file:///blank_page/blank_page.html"
+        },
+        {
+            "url": "file:///blank_page/blank_page.html"
+        },
+        {
+            "url": "file:///blank_page/blank_page.html"
+        },
+        {
+            "url": "file:///blank_page/blank_page.html"
+        },
+        {
+            "url": "file:///blank_page/blank_page.html"
+        },
+        {
+            "url": "file:///blank_page/blank_page.html"
+        },
+        {
+            "url": "file:///blank_page/blank_page.html"
+        },
+        {
+            "url": "file:///blank_page/blank_page.html"
+        },
+        {
+            "url": "file:///blank_page/blank_page.html"
+        },
+        {
+            "url": "file:///blank_page/blank_page.html"
+        },
+        {
+            "url": "file:///blank_page/blank_page.html"
+        },
+        {
+            "url": "file:///blank_page/blank_page.html"
+        }
+    ]
+}