Expand player stats and track metadata

Visible changes:
 - Add loadLatency stat
 - Add mimeType to tracks
 - Track state changes (buffering, playing, paused, ended)

Internal changes:
 - Track switchHistory, playTime, bufferingTime in private Stats struct
 - Remove dead timer code

Change-Id: I4566373251b9876b0d4f762a9d77aa50aea8ed00

lib/debug/timer.js

@@ -1,119 +0,0 @@
-/**
- * @license
- * Copyright 2016 Google Inc.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-goog.provide('shaka.timer');
-
-goog.require('shaka.log');
-
-
-/**
- * @namespace shaka.timer
- * @summary A performance timing framework.
- *   Used in both debugging and production builds.
- */
-
-
-/**
- * Begins a timer.
- *
- * @param {string} name
- */
-shaka.timer.begin = function(name) {
-  shaka.timer.timers_[name] = {
-    begin: shaka.timer.now_(),
-    end: NaN
-  };
-};
-
-
-/**
- * End a timer and log (debug) the elapsed time.
- * Does nothing if the timer has not begun.
- *
- * @param {string} name
- */
-shaka.timer.end = function(name) {
-  var record = shaka.timer.timers_[name];
-  if (!record) {
-    return;
-  }
-
-  record.end = shaka.timer.now_();
-  var diff = record.end - record.begin;
-  shaka.log.debug(name + ': ' + diff.toFixed(3) + 'ms');
-};
-
-
-/**
- * Log (debug) the diff between two or more completed timers and return it.
- * Does nothing if not all of the timers have begun.
- *
- * @param {string} name1
- * @param {string} name2
- * @param {...string} var_args
- * @return {number} The diff between the timers, or NaN if they have not all
- *   completed.
- */
-shaka.timer.diff = function(name1, name2, var_args) {
-  var t1 = shaka.timer.get(name1);
-  var t2 = shaka.timer.get(name2);
-  if (!t1 || !t2) {
-    return NaN;
-  }
-  var diff = t1 - t2;
-  var name = name1 + ' - ' + name2;
-
-  for (var i = 2; i < arguments.length; ++i) {
-    var name3 = arguments[i];
-    var t3 = shaka.timer.get(name3);
-    if (!t3) {
-      return NaN;
-    }
-    diff -= t3;
-    name += ' - ' + name3;
-  }
-
-  shaka.log.debug(name + ': ' + diff.toFixed(3) + 'ms');
-  return diff;
-};
-
-
-/**
- * Query a timer.
- *
- * @param {string} name
- * @return {number} The elapsed time in milliseconds, if the timer is complete.
- *   Returns NaN if the timer doesn't exist or hasn't ended yet.
- */
-shaka.timer.get = function(name) {
-  var record = shaka.timer.timers_[name];
-  if (!record || !record.end) {
-    return NaN;
-  }
-
-  return record.end - record.begin;
-};
-
-
-/** @private {function():number} */
-shaka.timer.now_ = window.performance && window.performance.now ?
-                       window.performance.now.bind(window.performance) :
-                       Date.now;
-
-
-/** @private {!Object.<string, {begin: number, end: number}>} */
-shaka.timer.timers_ = {};