Introduce a MetricsDataProvider interface.

chrome/browser/metrics/metrics_service_unittest.cc

 // 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.
 
 #include "chrome/browser/metrics/metrics_service.h"
 
 #include <string>
 
 #include "base/command_line.h"
 #include "base/threading/platform_thread.h"
@@ skipping 175 matching lines @@
 
 TEST_F(MetricsServiceTest, InitialStabilityLogAfterCrash) {
   EnableMetricsReporting();
   GetLocalState()->ClearPref(prefs::kStabilityExitedCleanly);
 
   // Set up prefs to simulate restarting after a crash.
 
   // Save an existing system profile to prefs, to correspond to what would be
   // saved from a previous session.
   TestMetricsLog log("client", 1);
-  log.RecordEnvironment(std::vector<content::WebPluginInfo>(),
+  log.RecordEnvironment(std::vector<metrics::MetricsDataProvider*>(),
+                        std::vector<content::WebPluginInfo>(),
                         GoogleUpdateMetrics(),
                         std::vector<chrome_variations::ActiveGroupId>());
 
   // Record stability build time and version from previous session, so that
   // stability metrics (including exited cleanly flag) won't be cleared.
   GetLocalState()->SetInt64(prefs::kStabilityStatsBuildTime,
                             MetricsLog::GetBuildTime());
   GetLocalState()->SetString(prefs::kStabilityStatsVersion,
                              MetricsLog::GetVersionString());
 
@@ skipping 147 matching lines @@
 
   service.RemoveObserver(&observer1);
 
   service.OpenNewLog();
   EXPECT_EQ(2, observer1.observed());
   EXPECT_EQ(2, observer2.observed());
   service.log_manager_.FinishCurrentLog();
 
   service.RemoveObserver(&observer2);
 }