Add benchmark that imitates news reading.

tools/perf/page_sets/data/memory_system_health_mobile.json

Index: tools/perf/page_sets/data/memory_system_health_mobile.json
diff --git a/tools/perf/page_sets/data/memory_system_health_mobile.json b/tools/perf/page_sets/data/memory_system_health_mobile.json
index 672952e28b0fe15fb282275a005b33440af35fc4..cdaa155cf0efbe197e4492d8394f499227042680 100644
--- a/tools/perf/page_sets/data/memory_system_health_mobile.json
+++ b/tools/perf/page_sets/data/memory_system_health_mobile.json
@@ -1,51 +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_mobile_005.wpr": [
-            "load:games:lazors", 
-            "load:games:bubbles", 
-            "load:games:spychase"
-        ], 
-        "memory_system_health_mobile_004.wpr": [
-            "load:tools:gmail", 
-            "load:tools:maps", 
-            "load:tools:stackoverflow", 
-            "load:tools:dropbox", 
-            "load:tools:weather", 
-            "load:tools:drive", 
-            "load:tools:docs"
-        ], 
-        "memory_system_health_mobile_001.wpr": [
-            "load:social:facebook", 
-            "load:social:tumblr", 
-            "load:social:twitter", 
-            "load:social:pinterest", 
-            "load:social:instagram"
-        ], 
-        "memory_system_health_mobile_003.wpr": [
-            "load:media:9gag", 
-            "load:media:google_images", 
-            "load:media:soundcloud", 
-            "load:media:youtube", 
-            "load:media:dailymotion", 
-            "load:media:flickr"
-        ], 
         "memory_system_health_mobile_000.wpr": [
-            "load:search:amazon", 
-            "load:search:baidu", 
-            "load:search:yandex", 
-            "load:search:google", 
-            "load:search:taobao", 
-            "load:search:ebay", 
+            "load:search:amazon",
+            "load:search:baidu",
+            "load:search:yandex",
+            "load:search:google",
+            "load:search:taobao",
+            "load:search:ebay",
             "load:search:yahoo"
-        ], 
+        ],
+        "memory_system_health_mobile_001.wpr": [
+            "load:social:tumblr",
+            "load:social:pinterest",
+            "load:social:instagram"
+        ],
         "memory_system_health_mobile_002.wpr": [
-            "load:news:cnn", 
-            "load:news:reddit", 
-            "load:news:sohu", 
-            "load:news:qq", 
-            "load:news:bbc", 
+            "load:news:sohu",
+            "load:news:bbc",
             "load:news:wikipedia"
+        ],
+        "memory_system_health_mobile_003.wpr": [
+            "load:media:9gag",
+            "load:media:google_images",
+            "load:media:soundcloud",
+            "load:media:youtube",
+            "load:media:dailymotion",
+            "load:media:flickr"
+        ],
+        "memory_system_health_mobile_004.wpr": [
+            "load:tools:gmail",
+            "load:tools:maps",
+            "load:tools:stackoverflow",
+            "load:tools:dropbox",
+            "load:tools:weather",
+            "load:tools:drive",
+            "load:tools:docs"
+        ],
+        "memory_system_health_mobile_005.wpr": [
+            "load:games:lazors",
+            "load:games:bubbles",
+            "load:games:spychase"
+        ],
+        "memory_system_health_mobile_006.wpr": [
+            "load:news:cnn"
+        ],
+        "memory_system_health_mobile_007.wpr": [
+            "load:social:facebook"
+        ],
+        "memory_system_health_mobile_008.wpr": [
+            "load:news:hackernews"
+        ],
+        "memory_system_health_mobile_009.wpr": [
+            "load:news:nytimes"
+        ],
+        "memory_system_health_mobile_010.wpr": [
+            "load:news:qq"
+        ],
+        "memory_system_health_mobile_011.wpr": [
+            "load:news:reddit"
+        ],
+        "memory_system_health_mobile_012.wpr": [
+            "load:social:twitter"
+        ],
+        "memory_system_health_mobile_013.wpr": [
+            "load:news:washingtonpost"
         ]
-    }
-}
+    },
+    "description": "Describes the Web Page Replay archives for a story set. Don't edit by hand! Use record_wpr for updating."
+}