Track when and how a profile is signed out via UMA.

chrome/browser/services/gcm/fake_signin_manager.h

 // Copyright 2014 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.
 
 #ifndef CHROME_BROWSER_SERVICES_GCM_FAKE_SIGNIN_MANAGER_H_
 #define CHROME_BROWSER_SERVICES_GCM_FAKE_SIGNIN_MANAGER_H_
 
 #include <string>
 
 #include "base/macros.h"
+#include "components/signin/core/browser/signin_metrics.h"
 
 #if defined(OS_CHROMEOS)
 #include "components/signin/core/browser/signin_manager_base.h"
 #else
 #include "base/compiler_specific.h"
 #include "components/signin/core/browser/signin_manager.h"
 #endif
 
 class KeyedService;
 class Profile;
 
 namespace content {
 class BrowserContext;
 }
 
 namespace gcm {
 
 #if defined(OS_CHROMEOS)
 class FakeSigninManager : public SigninManagerBase {
 #else
 class FakeSigninManager : public SigninManager {
 #endif
  public:
   explicit FakeSigninManager(Profile* profile);
   virtual ~FakeSigninManager();
 
   void SignIn(const std::string& username);
 #if defined(OS_CHROMEOS)
-  void SignOut();
+  void SignOut(signin_metrics::ProfileSignout signout_source_metric);
 #else
-  virtual void SignOut() OVERRIDE;
+  virtual void SignOut(signin_metrics::ProfileSignout signout_source_metric)
+      OVERRIDE;
 #endif
 
   static KeyedService* Build(content::BrowserContext* context);
 
  private:
   Profile* profile_;
 
   DISALLOW_COPY_AND_ASSIGN(FakeSigninManager);
 };
 
 }  // namespace gcm
 
 #endif  // CHROME_BROWSER_SERVICES_GCM_FAKE_SIGNIN_MANAGER_H_