1 files changed, 80 insertions, 0 deletions
diff --git a/chromium/content/browser/resources/media/player_info.js b/chromium/content/browser/resources/media/player_info.js
new file mode 100644
index 00000000000..af1f1944518
--- /dev/null
+++ b/chromium/content/browser/resources/media/player_info.js
@@ -0,0 +1,80 @@
+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+/**
+ * @fileoverview A class for keeping track of the details of a player.
+ */
+
+var PlayerInfo = (function() {
+  'use strict';
+
+  /**
+   * A class that keeps track of properties on a media player.
+   * @param id A unique id that can be used to identify this player.
+   */
+  function PlayerInfo(id) {
+    this.id = id;
+    // The current value of the properties for this player.
+    this.properties = {};
+    // All of the past (and present) values of the properties.
+    this.pastValues = {};
+
+    // Every single event in the order in which they were received.
+    this.allEvents = [];
+    this.lastRendered = 0;
+
+    this.firstTimestamp_ = -1;
+  }
+
+  PlayerInfo.prototype = {
+    /**
+     * Adds or set a property on this player.
+     * This is the default logging method as it keeps track of old values.
+     * @param timestamp  The time in milliseconds since the Epoch.
+     * @param key A String key that describes the property.
+     * @param value The value of the property.
+     */
+    addProperty: function(timestamp, key, value) {
+      // The first timestamp that we get will be recorded.
+      // Then, all future timestamps are deltas of that.
+      if (this.firstTimestamp_ === -1) {
+        this.firstTimestamp_ = timestamp;
+      }
+
+      if (typeof key !== 'string') {
+        throw new Error(typeof key + ' is not a valid key type');
+      }
+
+      this.properties[key] = value;
+
+      if (!this.pastValues[key]) {
+        this.pastValues[key] = [];
+      }
+
+      var recordValue = {
+        time: timestamp - this.firstTimestamp_,
+        key: key,
+        value: value
+      };
+
+      this.pastValues[key].push(recordValue);
+      this.allEvents.push(recordValue);
+    },
+
+    /**
+     * Adds or set a property on this player.
+     * Does not keep track of old values.  This is better for
+     * values that get spammed repeatedly.
+     * @param timestamp The time in milliseconds since the Epoch.
+     * @param key A String key that describes the property.
+     * @param value The value of the property.
+     */
+    addPropertyNoRecord: function(timestamp, key, value) {
+      this.addProperty(timestamp, key, value);
+      this.allEvents.pop();
+    }
+  };
+
+  return PlayerInfo;
+}());