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

chrome/browser/policy/cloud/user_policy_signin_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 "base/files/file_path.h"
 #include "base/message_loop/message_loop.h"
 #include "base/message_loop/message_loop_proxy.h"
 #include "base/prefs/pref_service.h"
 #include "base/run_loop.h"
 #include "base/time/time.h"
@@ skipping 70 matching lines @@
 class SigninManagerFake : public FakeSigninManager {
  public:
   explicit SigninManagerFake(Profile* profile)
       : FakeSigninManager(profile) {
     Initialize(NULL);
   }
 
   void ForceSignOut() {
     // Allow signing out now.
     prohibit_signout_ = false;
-    SignOut();
+    SignOut(signin_metrics::SIGNOUT_TEST);
   }
 
   static KeyedService* Build(content::BrowserContext* profile) {
     return new SigninManagerFake(static_cast<Profile*>(profile));
   }
 };
 
 UserCloudPolicyManager* BuildCloudPolicyManager(
     content::BrowserContext* context) {
   MockUserCloudPolicyStore *store = new MockUserCloudPolicyStore();
@@ skipping 467 matching lines @@
 
 TEST_F(UserPolicySigninServiceSignedInTest, SignOutAfterInit) {
   // UserCloudPolicyManager should be initialized.
   EXPECT_EQ(mock_store_->signin_username_, kTestUser);
   ASSERT_TRUE(manager_->core()->service());
 
   // Signing out will clear the policy from the store.
   EXPECT_CALL(*mock_store_, Clear());
 
   // Now sign out.
-  SigninManagerFactory::GetForProfile(profile_.get())->SignOut();
+  SigninManagerFactory::GetForProfile(profile_.get())->SignOut(
+      signin_metrics::SIGNOUT_TEST);
 
   // UserCloudPolicyManager should be shut down.
   ASSERT_FALSE(manager_->core()->service());
 }
 
 TEST_F(UserPolicySigninServiceTest, RegisterPolicyClientOAuthFailure) {
   UserPolicySigninService* signin_service =
       UserPolicySigninServiceFactory::GetForProfile(profile_.get());
   RegisterPolicyClientWithCallback(signin_service);
   Mock::VerifyAndClearExpectations(this);
@@ skipping 222 matching lines @@
   base::RunLoop().RunUntilIdle();
   EXPECT_FALSE(manager_->IsClientRegistered());
 #if !defined(OS_ANDROID)
   EXPECT_FALSE(signin_manager_->IsSignoutProhibited());
 #endif
 }
 
 }  // namespace
 
 }  // namespace policy