Add support for single sample metrics.

components/test/components_test_suite.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 "components/test/components_test_suite.h"
 
 #include <memory>
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "base/metrics/statistics_recorder.h"
 #include "base/path_service.h"
 #include "base/test/launcher/unit_test_launcher.h"
 #include "base/test/test_suite.h"
 #include "build/build_config.h"
 #include "components/content_settings/core/common/content_settings_pattern.h"
+#include "mojo/edk/embedder/embedder.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/base/ui_base_paths.h"
 #include "url/url_util.h"
 
 #if !defined(OS_IOS)
 #include "content/public/common/content_client.h"
 #include "content/public/test/content_test_suite_base.h"
 #include "content/public/test/test_content_client_initializer.h"
 #include "content/public/test/unittest_test_suite.h"
@@ skipping 16 matching lines @@
 namespace {
 
 class ComponentsTestSuite : public base::TestSuite {
  public:
   ComponentsTestSuite(int argc, char** argv) : base::TestSuite(argc, argv) {}
 
  private:
   void Initialize() override {
     base::TestSuite::Initialize();
 
+    mojo::edk::Init();
+
     // Initialize the histograms subsystem, so that any histograms hit in tests
     // are correctly registered with the statistics recorder and can be queried
     // by tests.
     base::StatisticsRecorder::Initialize();
 
 #if !defined(OS_IOS)
     gl::GLSurfaceTestSupport::InitializeOneOff();
 
     // Setup content scheme statics.
     {
@@ skipping 93 matching lines @@
   testing::TestEventListeners& listeners =
       testing::UnitTest::GetInstance()->listeners();
   listeners.Append(new ComponentsUnitTestEventListener());
 
 #if !defined(OS_IOS)
   return base::Bind(&content::UnitTestTestSuite::Run, std::move(test_suite));
 #else
   return base::Bind(&base::TestSuite::Run, std::move(test_suite));
 #endif
 }