Create and integrate a metrics service client into Blimp engine.

blimp/engine/common/blimp_browser_context_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 "blimp/engine/common/blimp_browser_context.h"
+
+#include "base/message_loop/message_loop.h"
+#include "base/metrics/user_metrics.h"
+#include "base/run_loop.h"
+#include "components/metrics/metrics_service.h"
+#include "content/public/test/test_browser_thread_bundle.h"
+#include "net/log/net_log.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace blimp {
+namespace engine {
+
+class BlimpBrowserContextTest : public testing::Test {
+ protected:

[Alexei Svitkine (slow), 2016/05/10 17:38:07]

Nit: Begin with a public section. Probably fine to have SetUp/TearDown be public
here.

[Jess, 2016/05/10 18:23:49]

Created a public section for the default constructor that now must be included
explicitly due to the addition of DISALLOW_COPY_AND_ASSIGN.

+  void SetUp() override;
+  void TearDown() override;
+ private:

[Alexei Svitkine (slow), 2016/05/10 17:38:07]

Nit: Empty line above this.

[Jess, 2016/05/10 18:23:49]

Done.

+  content::TestBrowserThreadBundle thread_bundle_;
+  net::NetLog net_log_;
+  std::unique_ptr<BlimpBrowserContext> browser_context_;
+};

[Alexei Svitkine (slow), 2016/05/10 17:38:07]

Nit: DISALLOW_COPY_AND_ASSIGN().

[Jess, 2016/05/10 18:23:49]

Done.

+
+void BlimpBrowserContextTest::SetUp() {

[Alexei Svitkine (slow), 2016/05/10 17:38:07]

Nit: You can probably declare these inline.

[Jess, 2016/05/10 18:23:49]

Done.

+  base::SetRecordActionTaskRunner(
+      base::MessageLoop::current()->task_runner());
+  // Create BlimpBrowserContext.
+  browser_context_.reset(new BlimpBrowserContext(false /* off_the_record */,
+                                                 &net_log_));
+}
+
+void BlimpBrowserContextTest::TearDown() {
+  // Clears static variable in MetricsService
+  metrics::MetricsService::SetExecutionPhase(
+      metrics::MetricsService::UNINITIALIZED_PHASE,
+      browser_context_->GetPrefService());
+}
+
+TEST_F(BlimpBrowserContextTest, CtorDtor) {
+  // Covers construction and destruction of BlimpBrowserContext and
+  // associated metrics setup and teardown.
+}
+
+}  // namespace engine
+}  // namespace blimp