Create MetricsPrivateDelegate for metricsPrivate behavior

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

 // Copyright (c) 2012 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 metrics_apitest.cc.
 chrome.test.runTests([
+  function getIsCrashReportingEnabled() {
+    chrome.metricsPrivate.getIsCrashReportingEnabled(function(enabled) {
+      chrome.test.assertEq('boolean', typeof enabled);

[Devlin, 2016/10/01 01:25:14]

It'd be kind of nice to verify the result is correct, but I suppose that might
be out of scope for this CL.  But if you wanted to do it anyway... ;)

+      chrome.test.succeed();
+    });
+  },
+
   function recordUserAction() {
     // Log a metric once.
     chrome.metricsPrivate.recordUserAction('test.ua.1');
 
     // Log a metric more than once.
     chrome.metricsPrivate.recordUserAction('test.ua.2');
     chrome.metricsPrivate.recordUserAction('test.ua.2');
 
     chrome.test.succeed();
   },
@@ skipping 123 matching lines @@
     // This one should be rejected because the bucket count is different.
     // We check for sample count == 2 in metrics_apitest.cc
     chrome.metricsPrivate.recordValue(log2, 42);
     chrome.metricsPrivate.recordValue(log1, 42);
 
     chrome.test.succeed();
   },
 
 ]);