Add benchmark that imitates news reading.

tools/perf/page_sets/data/memory_system_health_desktop.json

Index: tools/perf/page_sets/data/memory_system_health_desktop.json
diff --git a/tools/perf/page_sets/data/memory_system_health_desktop.json b/tools/perf/page_sets/data/memory_system_health_desktop.json
index 18400562585750e69031143a56de87fd11e49887..12ee0772acd8edfc658606faa59d7bb07d84ade4 100644
--- a/tools/perf/page_sets/data/memory_system_health_desktop.json
+++ b/tools/perf/page_sets/data/memory_system_health_desktop.json
@@ -1,54 +1,70 @@
 {
-    "description": "Describes the Web Page Replay archives for a story set. Don't edit by hand! Use record_wpr for updating.", 
     "archives": {
-        "memory_system_health_desktop_004.wpr": [
-            "load:tools:drive", 
-            "load:tools:docs", 
-            "load:tools:gmail", 
-            "load:tools:maps", 
-            "load:tools:stackoverflow", 
-            "load:tools:dropbox", 
-            "load:tools:weather"
-        ], 
-        "memory_system_health_desktop_002.wpr": [
-            "load:news:cnn", 
-            "load:news:reddit", 
-            "load:news:qq", 
-            "load:news:bbc", 
-            "load:news:wikipedia"
-        ], 
-        "memory_system_health_desktop_005.wpr": [
-            "load:games:spychase", 
-            "load:games:alphabetty", 
-            "load:games:bubbles", 
-            "load:games:miniclip", 
-            "load:games:lazors"
-        ], 
         "memory_system_health_desktop_000.wpr": [
-            "load:search:amazon", 
-            "load:search:flipkart", 
-            "load:search:ebay", 
-            "load:search:google", 
-            "load:search:yandex", 
-            "load:search:taobao", 
-            "load:search:yahoo", 
+            "load:search:amazon",
+            "load:search:flipkart",
+            "load:search:ebay",
+            "load:search:google",
+            "load:search:yandex",
+            "load:search:taobao",
+            "load:search:yahoo",
             "load:search:baidu"
-        ], 
-        "memory_system_health_desktop_003.wpr": [
-            "load:media:soundcloud", 
-            "load:media:dailymotion", 
-            "load:media:9gag", 
-            "load:media:flickr", 
-            "load:media:google_images", 
-            "load:media:youtube"
-        ], 
+        ],
         "memory_system_health_desktop_001.wpr": [
-            "load:social:facebook", 
-            "load:social:instagram", 
-            "load:social:twitter", 
-            "load:social:pinterest", 
-            "load:social:vk", 
+            "load:social:instagram",
+            "load:social:pinterest",
+            "load:social:vk",
             "load:social:tumblr"
+        ],
+        "memory_system_health_desktop_002.wpr": [
+            "load:news:bbc",
+            "load:news:wikipedia"
+        ],
+        "memory_system_health_desktop_003.wpr": [
+            "load:media:soundcloud",
+            "load:media:dailymotion",
+            "load:media:9gag",
+            "load:media:flickr",
+            "load:media:google_images",
+            "load:media:youtube"
+        ],
+        "memory_system_health_desktop_004.wpr": [
+            "load:tools:drive",
+            "load:tools:docs",
+            "load:tools:gmail",
+            "load:tools:maps",
+            "load:tools:stackoverflow",
+            "load:tools:dropbox",
+            "load:tools:weather"
+        ],
+        "memory_system_health_desktop_005.wpr": [
+            "load:games:spychase",
+            "load:games:alphabetty",
+            "load:games:bubbles",
+            "load:games:miniclip",
+            "load:games:lazors"
+        ],
+        "memory_system_health_desktop_006.wpr": [
+            "load:news:cnn"
+        ],
+        "memory_system_health_desktop_007.wpr": [
+            "load:social:facebook"
+        ],
+        "memory_system_health_desktop_008.wpr": [
+            "load:news:hackernews"
+        ],
+        "memory_system_health_desktop_009.wpr": [
+            "load:news:nytimes"
+        ],
+        "memory_system_health_desktop_010.wpr": [
+            "load:news:qq"
+        ],
+        "memory_system_health_desktop_011.wpr": [
+            "load:news:reddit"
+        ],
+        "memory_system_health_desktop_012.wpr": [
+            "load:social:twitter"
         ]
-    }
-}
+    },
+    "description": "Describes the Web Page Replay archives for a story set. Don't edit by hand! Use record_wpr for updating."
+}