[Media Router] Add UMA histograms tracking component extension version/wakeups

chrome/browser/media/router/media_router_metrics_unittest.cc

+// Copyright 2016 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.
+
+#include "chrome/browser/media/router/media_router_metrics.h"
+
+#include "base/version.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace media_router {
+
+#if !defined(OS_ANDROID)

[Wez, 2016/03/22 21:50:06]

nit: Would be cleaner to make these unittests.cc conditional in the GN+GYP
files, rather than #ifdefing here.

+TEST(MediaRouteProviderMetricsTest, TestGetMediaRouteProviderVersion) {
+  const base::Version kBrowserVersion("50.0.2396.71");
+  EXPECT_EQ(MediaRouteProviderVersion::SAME_VERSION_AS_CHROME,
+            MediaRouterMetrics::GetMediaRouteProviderVersion(
+                base::Version("50.0.2396.71"), kBrowserVersion));
+  EXPECT_EQ(MediaRouteProviderVersion::SAME_VERSION_AS_CHROME,
+            MediaRouterMetrics::GetMediaRouteProviderVersion(
+                base::Version("50.0.2100.0"), kBrowserVersion));
+  EXPECT_EQ(MediaRouteProviderVersion::SAME_VERSION_AS_CHROME,
+            MediaRouterMetrics::GetMediaRouteProviderVersion(
+                base::Version("51.0.2117.0"), kBrowserVersion));
+  EXPECT_EQ(MediaRouteProviderVersion::ONE_VERSION_BEHIND_CHROME,
+            MediaRouterMetrics::GetMediaRouteProviderVersion(
+                base::Version("49.0.2138.0"), kBrowserVersion));
+  EXPECT_EQ(MediaRouteProviderVersion::MULTIPLE_VERSIONS_BEHIND_CHROME,
+            MediaRouterMetrics::GetMediaRouteProviderVersion(
+                base::Version("47.0.1134.0"), kBrowserVersion));
+  EXPECT_EQ(MediaRouteProviderVersion::UNKNOWN,
+            MediaRouterMetrics::GetMediaRouteProviderVersion(
+                base::Version("blargh"), kBrowserVersion));
+  EXPECT_EQ(MediaRouteProviderVersion::UNKNOWN,
+            MediaRouterMetrics::GetMediaRouteProviderVersion(base::Version(""),
+                                                             kBrowserVersion));
+  EXPECT_EQ(MediaRouteProviderVersion::UNKNOWN,
+            MediaRouterMetrics::GetMediaRouteProviderVersion(
+                base::Version("-1.0.0.0"), kBrowserVersion));
+  EXPECT_EQ(MediaRouteProviderVersion::UNKNOWN,
+            MediaRouterMetrics::GetMediaRouteProviderVersion(base::Version("0"),
+                                                             kBrowserVersion));
+}
+#endif  // !defined(OS_ANDROID)
+
+}  // namespace media_router