Add a metrics extensions API....

chrome/test/data/extensions/api_test/metrics/test.js

+// Copyright (c) 2010 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.
+
+// metrics api test
+// browser_tests.exe --gtest_filter=ExtensionApiTest.Metrics
+
+// Any changes to the logging done in these functions should be matched
+// with the checks done in IN_PROC_BROWSER_TEST_F(ExtensionApiTest, Metrics).
+// See extension_metrics_apitest.cc.
+chrome.test.runTests([
+  function recordUserAction() {
+    // Log a metric once.
+    chrome.metrics.recordUserAction('test.ua.1');
+
+    // Log a metric more than once.
+    chrome.metrics.recordUserAction('test.ua.2');
+    chrome.metrics.recordUserAction('test.ua.2');
+
+    chrome.test.succeed();
+  },
+
+  function recordValue() {
+    chrome.metrics.recordValue({
+      'metricName': 'test.h.1',
+      'type': 'histogram-log',
+      'min': 1,
+      'max': 100,
+      'buckets': 50
+    }, 42);
+
+    chrome.metrics.recordValue({
+      'metricName': 'test.h.2',
+      'type': 'histogram-linear',
+      'min': 1,
+      'max': 200,
+      'buckets': 50
+    }, 42);
+
+    chrome.metrics.recordPercentage('test.h.3', 42);
+    chrome.metrics.recordPercentage('test.h.3', 42);
+
+    chrome.test.succeed();
+  },
+
+  function recordTimes() {
+    chrome.metrics.recordTime('test.time', 42);
+    chrome.metrics.recordMediumTime('test.medium.time', 42 * 1000);
+    chrome.metrics.recordLongTime('test.long.time', 42 * 1000 * 60);
+
+    chrome.test.succeed();
+  },
+
+  function recordCounts() {
+    chrome.metrics.recordCount('test.count', 420000);
+    chrome.metrics.recordMediumCount('test.medium.count', 4200);
+    chrome.metrics.recordSmallCount('test.small.count', 42);
+
+    chrome.test.succeed();
+  }
+]);
+