Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

core/vendor/phpunit/php-timer/README.md

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+# PHP_Timer
+
+Utility class for timing things, factored out of PHPUnit into a stand-alone component.
+
+## Installation
+
+You can use the [PEAR Installer](http://pear.php.net/manual/en/guide.users.commandline.cli.php) or [Composer](http://getcomposer.org/) to download and install this package as well as its dependencies.
+
+### PEAR Installer
+
+The following two commands (which you may have to run as `root`) are all that is required to install this package using the PEAR Installer:
+
+    pear config-set auto_discover 1
+    pear install pear.phpunit.de/PHP_Timer
+
+### Composer
+
+To add this package as a local, per-project dependency to your project, simply add a dependency on `phpunit/php-timer` to your project's `composer.json` file. Here is a minimal example of a `composer.json` file that just defines a dependency on PHP_Timer:
+
+    {
+        "require": {
+            "phpunit/php-timer": "*"
+        }
+    }
+
+### Usage
+
+#### Basic Timing
+
+```php
+PHP_Timer::start();
+
+$timer->start();
+
+// ...
+
+$time = PHP_Timer::stop();
+var_dump($time);
+
+print PHP_Timer::secondsToTimeString($time);
+```
+
+The code above yields the output below:
+
+    double(1.0967254638672E-5)
+    0 ms
+
+#### Resource Consumption Since PHP Startup
+
+```php
+print PHP_Timer::resourceUsage();
+```
+
+The code above yields the output below:
+
+    Time: 0 ms, Memory: 0.50Mb