Move ChromeOS hardware class init out of MetricsService.

chrome/browser/metrics/chromeos_metrics_provider.h

Index: chrome/browser/metrics/chromeos_metrics_provider.h
diff --git a/chrome/browser/metrics/chromeos_metrics_provider.h b/chrome/browser/metrics/chromeos_metrics_provider.h
index 934a3cfca8e79d68955067a7c55c3220500afa0d..ac36b961b5f43c80f1fc39b7a61ba9d2ce3d5294 100644
--- a/chrome/browser/metrics/chromeos_metrics_provider.h
+++ b/chrome/browser/metrics/chromeos_metrics_provider.h
@@ -30,6 +30,11 @@ class ChromeOSMetricsProvider : public metrics::MetricsProvider {
   // Records a crash.
   static void LogCrash(const std::string& crash_type);
 
+  // Called on the FILE thread to load hardware class information. When this
+  // task is complete, |callback| is run on |target_loop|.
+  void InitTaskGetHardwareClass(base::MessageLoopProxy* target_loop,
+                                const base::Closure& callback);
+
   // metrics::MetricsProvider:
   virtual void OnDidCreateMetricsLog() OVERRIDE;
   virtual void ProvideSystemProfileMetrics(
@@ -65,6 +70,10 @@ class ChromeOSMetricsProvider : public metrics::MetricsProvider {
   // true.
   uint64 user_count_at_log_initialization_;
 
+  // Hardware class (e.g., hardware qualification ID). This class identifies
+  // the configured system components such as CPU, WiFi adapter, etc.
+  std::string hardware_class_;
+
   DISALLOW_COPY_AND_ASSIGN(ChromeOSMetricsProvider);
 };