Factor ChromeOS specific code out of MetricsLog.

chrome/browser/metrics/metrics_log.h

Index: chrome/browser/metrics/metrics_log.h
diff --git a/chrome/browser/metrics/metrics_log.h b/chrome/browser/metrics/metrics_log.h
index bd67ff85defd312a5ec2733cfb859633502a0335..54c25f9feb9a98b01f7c18ca3e9ddb3f5a395118 100644
--- a/chrome/browser/metrics/metrics_log.h
+++ b/chrome/browser/metrics/metrics_log.h
@@ -19,7 +19,7 @@
 #include "ui/gfx/size.h"
 
 #if defined(OS_CHROMEOS)
-#include "chrome/browser/metrics/perf_provider_chromeos.h"
+#include "metrics_log_chromeos.h"

[Alexei Svitkine (slow), 2014/01/30 18:17:54]

This should still be a full include path.

Though, perhaps you can get away with a forward decl here?

[tdresser, 2014/01/30 19:32:30]

Done.

 #endif
 
 class MetricsNetworkObserver;
@@ -35,10 +35,6 @@ namespace content {
 struct WebPluginInfo;
 }
 
-namespace device {
-class BluetoothAdapter;
-}
-
 namespace tracked_objects {
 struct ProcessDataSnapshot;
 }
@@ -145,6 +141,11 @@ class MetricsLog : public MetricsLogBase {
   virtual void GetFieldTrialIds(
       std::vector<chrome_variations::ActiveGroupId>* field_trial_ids) const;
 
+  // Exposed to allow dependency injection for tests.
+#if defined(OS_CHROMEOS)
+  scoped_ptr<MetricsLogChromeOS> metrics_log_chromeos_;
+#endif
+
  private:
   FRIEND_TEST_ALL_PREFIXES(MetricsLogTest, ChromeOSStabilityData);
 
@@ -176,32 +177,9 @@ class MetricsLog : public MetricsLogBase {
   // This is a no-op if called on a non-Windows platform.
   void WriteGoogleUpdateProto(const GoogleUpdateMetrics& google_update_metrics);
 
-  // Sets the Bluetooth Adapter instance used for the WriteBluetoothProto()
-  // call.
-  void SetBluetoothAdapter(scoped_refptr<device::BluetoothAdapter> adapter);
-
-  // Writes info about paired Bluetooth devices on this system.
-  // This is a no-op if called on a non-Chrome OS platform.
-  virtual void WriteBluetoothProto(
-      metrics::SystemProfileProto::Hardware* hardware);
-
-#if defined(OS_CHROMEOS)
-  // Update the number of users logged into a multi-profile session.
-  // If the number of users change while the log is open, the call invalidates
-  // the user count value.
-  void UpdateMultiProfileUserCount();
-#endif
-
   // Observes network state to provide values for SystemProfile::Network.
   MetricsNetworkObserver network_observer_;
 
-#if defined(OS_CHROMEOS)
-  metrics::PerfProvider perf_provider_;
-#endif
-
-  // Bluetooth Adapter instance for collecting information about paired devices.
-  scoped_refptr<device::BluetoothAdapter> adapter_;
-
   // The time when the current log was created.
   const base::TimeTicks creation_time_;