First page-set for media-related metrics measurement.

tools/perf/page_sets/tough_video_cases.json

Index: tools/perf/page_sets/tough_video_cases.json
diff --git a/tools/perf/page_sets/tough_video_cases.json b/tools/perf/page_sets/tough_video_cases.json
index e1b9074519a047e0e84fb19ef883f0f9e4c49c76..ea3888c8c9dd05eb6789b5ccfcddfc9b5bf13299 100644
--- a/tools/perf/page_sets/tough_video_cases.json
+++ b/tools/perf/page_sets/tough_video_cases.json
@@ -2,7 +2,137 @@
   "description": "Video Stack Perf benchmark",
   "pages": [
     {
-      "url": "file:///tough_video_cases/video.html",
+      "url": "file:///tough_video_cases/video.html?src=crowd.wav&id=audio_1&type=audio",
+      "media_metrics": [
+        { "action": "play",
+          "selector": "#audio_1",
+          "wait_for_playing": true,
+          "wait_for_ended": true
+        }
+      ]
+    },
+    {
+      "url": "file:///tough_video_cases/video.html?src=crowd.ogg&id=audio_1&type=audio",
+      "media_metrics": [
+        { "action": "play",
+          "selector": "#audio_1",
+          "wait_for_playing": true,
+          "wait_for_ended": true
+        }
+      ]
+    },
+    {
+      "url": "file:///tough_video_cases/video.html?src=crowd1080.mp4&id=video_1&type=video",
+      "media_metrics": [
+        { "action": "play",
+          "selector": "#video_1",
+          "wait_for_playing": true,
+          "wait_for_ended": true
+        }
+      ]
+    },
+    {
+      "url": "file:///tough_video_cases/video.html?src=crowd1080.ogv&id=video_1&type=video",
+      "media_metrics": [
+        { "action": "play",
+          "selector": "#video_1",
+          "wait_for_playing": true,
+          "wait_for_ended": true
+        }
+      ]
+    },
+    {
+      "url": "file:///tough_video_cases/video.html?src=crowd1080.webm&id=video_1&type=video",
+      "media_metrics": [
+        { "action": "play",
+          "selector": "#video_1",
+          "wait_for_playing": true,
+          "wait_for_ended": true
+        }
+      ]
+    },
+    {
+      "url": "file:///tough_video_cases/video.html?src=crowd2160.mp4&id=video_1&type=video",
+      "media_metrics": [
+        { "action": "play",
+          "selector": "#video_1",
+          "wait_for_playing": true,
+          "wait_for_ended": true
+        }
+      ]
+    },
+    {
+      "url": "file:///tough_video_cases/video.html?src=crowd2160.ogv&id=video_1&type=video",
+      "media_metrics": [
+        { "action": "play",
+          "selector": "#video_1",
+          "wait_for_playing": true,
+          "wait_for_ended": true
+        }
+      ]
+    },
+    {
+      "url": "file:///tough_video_cases/video.html?src=crowd2160.webm&id=video_1&type=video",
+      "media_metrics": [
+        { "action": "play",
+          "selector": "#video_1",
+          "wait_for_playing": true,
+          "wait_for_ended": true
+        }
+      ]
+    },
+    {
+      "url": "file:///tough_video_cases/video.html?src=tulip2.mp3&id=audio_1&type=audio",
+      "media_metrics": [
+        { "action": "play",
+          "selector": "#audio_1",
+          "wait_for_playing": true,
+          "wait_for_ended": true
+        }
+      ]
+    },
+    {
+      "url": "file:///tough_video_cases/video.html?src=tulip2.ogg&id=audio_1&type=audio",
+      "media_metrics": [
+        { "action": "play",
+          "selector": "#audio_1",
+          "wait_for_playing": true,
+          "wait_for_ended": true
+        }
+      ]
+    },
+    {
+      "url": "file:///tough_video_cases/video.html?src=tulip2.wav&id=audio_1&type=audio",
+      "media_metrics": [
+        { "action": "play",
+          "selector": "#audio_1",
+          "wait_for_playing": true,
+          "wait_for_ended": true
+        }
+      ]
+    },
+    {
+      "url": "file:///tough_video_cases/video.html?src=tulip2.mp4&id=video_1&type=video",
+      "media_metrics": [
+        { "action": "play",
+          "selector": "#video_1",
+          "wait_for_playing": true,
+          "wait_for_ended": true
+        }
+      ]
+    },
+    {
+      "url": "file:///tough_video_cases/video.html?src=tulip2.ogv&id=video_1&type=video",
+      "media_metrics": [
+        { "action": "play",
+          "selector": "#video_1",
+          "wait_for_playing": true,
+          "wait_for_ended": true
+        }
+      ]
+    },
+    {
+      "url": "file:///tough_video_cases/video.html?src=tulip2.webm&id=video_1&type=video",
       "media_metrics": [
         { "action": "play",
           "selector": "#video_1",