Reland "[profiles] Clean up guest ephemeral profile on startup"

This reverts commit b62892aa.

Reason for revert: Removed the directory existence check that was
failing. Directories are removed on a background thread and there is
no reliable way of waiting until the remove is complete.

Original change's description:
> Revert "[profiles] Clean up guest ephemeral profile on startup"
>
> This reverts commit d660a480.
>
> Reason for revert:
> Test fails:
> https://ci.chromium.org/ui/p/chromium/builders/ci/Win%207%20Tests%20x64%20(1)/76721/overview
>
> Original change's description:
> > [profiles] Clean up guest ephemeral profile on startup
> >
> > This CL fixes a bug which leads to the guest ephemeral profile not being
> > cleaned up on startup if it has been left over in the previous session.
> >
> > ProfileManager::CleanUpEphemeralProfiles() needs to pass the `true`
> > parameter in ProfileAttributesStorage::GetAllProfilesAttributes() to get
> > the full list of registered profiles.
> >
> > Bug: 1167883
> > Change-Id: I3051a9174e8472eb2af046126be88dbfb44bcb47
> > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2635158
> > Commit-Queue: Alex Ilin <alexilin@chromium.org>
> > Reviewed-by: David Roger <droger@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#844749}
>
> TBR=droger@chromium.org,alexilin@chromium.org,chromium-scoped@luci-project-accounts.iam.gserviceaccount.com
>
> Change-Id: I6fb55866ddcda42c54d60aaa2e823da18b353348
> No-Presubmit: true
> No-Tree-Checks: true
> No-Try: true
> Bug: 1167883
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2637395
> Reviewed-by: Xida Chen <xidachen@chromium.org>
> Commit-Queue: Xida Chen <xidachen@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#844779}

TBR=droger@chromium.org,xidachen@chromium.org,alexilin@chromium.org,chromium-scoped@luci-project-accounts.iam.gserviceaccount.com

# Not skipping CQ checks because this is a reland.

Bug: 1167883
Change-Id: I8f78c419804e91aaa6279660160a6310353415ab
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2637479Reviewed-by: David Roger <droger@chromium.org>
Commit-Queue: Alex Ilin <alexilin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844904}

chrome/browser/profiles/profile_manager.cc

@@ -996,7 +996,7 @@ void ProfileManager::CleanUpEphemeralProfiles() {
   std::vector<base::FilePath> profiles_to_delete;
   ProfileAttributesStorage& storage = GetProfileAttributesStorage();
   std::vector<ProfileAttributesEntry*> entries =
-      storage.GetAllProfilesAttributes();
+      storage.GetAllProfilesAttributes(/*include_guest_profile=*/true);
   for (ProfileAttributesEntry* entry : entries) {
     base::FilePath profile_path = entry->GetPath();
     if (entry->IsEphemeral()) {

chrome/browser/profiles/profile_manager_browsertest.cc

@@ -64,14 +64,16 @@ void OnUnblockOnProfileCreation(base::RunLoop* run_loop,
     run_loop->Quit();
 }
 
-void ProfileCreationComplete(Profile* profile, Profile::CreateStatus status) {
+void ProfileCreationComplete(base::OnceClosure completion_callback,
+                             Profile* profile,
+                             Profile::CreateStatus status) {
   ASSERT_NE(status, Profile::CREATE_STATUS_LOCAL_FAIL);
   ASSERT_NE(status, Profile::CREATE_STATUS_REMOTE_FAIL);
   // No browser should have been created for this profile yet.
   EXPECT_EQ(chrome::GetBrowserCount(profile), 0U);
   EXPECT_EQ(chrome::GetTotalBrowserCount(), 1U);
   if (status == Profile::CREATE_STATUS_INITIALIZED)
-    base::RunLoop::QuitCurrentWhenIdleDeprecated();
+    std::move(completion_callback).Run();
 }
 
 // An observer that returns back to test code after one or more profiles was
@@ -147,11 +149,12 @@ class MultipleProfileDeletionObserver
   DISALLOW_COPY_AND_ASSIGN(MultipleProfileDeletionObserver);
 };
 
-void EphemeralProfileCreationComplete(Profile* profile,
+void EphemeralProfileCreationComplete(base::OnceClosure completion_callback,
+                                      Profile* profile,
                                       Profile::CreateStatus status) {
   if (status == Profile::CREATE_STATUS_INITIALIZED)
     profile->GetPrefs()->SetBoolean(prefs::kForceEphemeralProfiles, true);
-  ProfileCreationComplete(profile, status);
+  ProfileCreationComplete(std::move(completion_callback), profile, status);
 }
 
 class ProfileRemovalObserver : public ProfileAttributesStorage::Observer {
@@ -483,12 +486,13 @@ IN_PROC_BROWSER_TEST_F(ProfileManagerBrowserTest,
 
   // Create a profile, make sure callback is invoked before any callbacks are
   // invoked (so they can do things like sign in the profile, etc).
+  base::RunLoop run_loop;
   ProfileManager::CreateMultiProfileAsync(
       base::string16(),  // name
       std::string(),     // icon url
-      base::BindRepeating(ProfileCreationComplete));
-  // Wait for profile to finish loading.
-  content::RunMessageLoop();
+      base::BindRepeating(&ProfileCreationComplete,
+                          run_loop.QuitWhenIdleClosure()));
+  run_loop.Run();
   EXPECT_EQ(profile_manager->GetNumberOfProfiles(), 2U);
   EXPECT_EQ(chrome::GetTotalBrowserCount(), 2U);
 
@@ -621,12 +625,13 @@ IN_PROC_BROWSER_TEST_F(ProfileManagerBrowserTest, MAYBE_EphemeralProfile) {
   // Create an ephemeral profile.
   base::FilePath path_profile2 =
       profile_manager->GenerateNextProfileDirectoryPath();
+  base::RunLoop run_loop;
   profile_manager->CreateProfileAsync(
-      path_profile2, base::BindRepeating(&EphemeralProfileCreationComplete),
+      path_profile2,
+      base::BindRepeating(&EphemeralProfileCreationComplete,
+                          run_loop.QuitWhenIdleClosure()),
       base::string16(), std::string());
-
-  // Spin to allow profile creation to take place.
-  content::RunMessageLoop();
+  run_loop.Run();
 
   BrowserList* browser_list = BrowserList::GetInstance();
   ASSERT_EQ(initial_profile_count + 1U, storage.GetNumberOfProfiles());
@@ -754,6 +759,74 @@ IN_PROC_BROWSER_TEST_F(ProfileManagerBrowserTest, IncognitoProfile) {
 }
 
 #if !defined(OS_ANDROID) && !BUILDFLAG(IS_CHROMEOS_ASH)
+
+class ProfileManagerEphemeralGuestProfileBrowserTest
+    : public ProfileManagerBrowserTest {
+ public:
+  ProfileManagerEphemeralGuestProfileBrowserTest() {
+    scoped_feature_list_.InitAndEnableFeature(
+        features::kEnableEphemeralGuestProfilesOnDesktop);
+  }
+
+ private:
+  base::test::ScopedFeatureList scoped_feature_list_;
+};
+
+IN_PROC_BROWSER_TEST_F(ProfileManagerEphemeralGuestProfileBrowserTest,
+                       PRE_CleanUpEphemeralProfilesOnStartup) {
+  // If multiprofile mode is not enabled, you can't switch between profiles.
+  if (!profiles::IsMultipleProfilesEnabled())
+    return;
+
+  ProfileManager* profile_manager = g_browser_process->profile_manager();
+  ProfileAttributesStorage& storage =
+      profile_manager->GetProfileAttributesStorage();
+  EXPECT_EQ(1u, storage.GetNumberOfProfiles(true));
+
+  // Create an ephemeral profile.
+  base::FilePath ephemeral_profile_path =
+      profile_manager->GenerateNextProfileDirectoryPath();
+  base::RunLoop run_loop;
+  profile_manager->CreateProfileAsync(
+      ephemeral_profile_path,
+      base::BindRepeating(&EphemeralProfileCreationComplete,
+                          run_loop.QuitWhenIdleClosure()),
+      base::string16(), std::string());
+  run_loop.Run();
+
+  // Create an ephemeral guest profile.
+  base::FilePath guest_path = profile_manager->GetGuestProfilePath();
+  base::RunLoop run_loop2;
+  profile_manager->CreateProfileAsync(
+      guest_path,
+      base::BindRepeating(&ProfileCreationComplete,
+                          run_loop2.QuitWhenIdleClosure()),
+      base::string16(), std::string());
+  run_loop2.Run();
+  Profile* guest = profile_manager->GetProfileByPath(guest_path);
+  EXPECT_TRUE(guest->IsEphemeralGuestProfile());
+
+  BrowserList* browser_list = BrowserList::GetInstance();
+  ASSERT_EQ(3U, storage.GetNumberOfProfiles(true));
+  EXPECT_EQ(1U, browser_list->size());
+
+  // Do not open browser windows for ephemeral profiles so that they don't
+  // get deleted in this session.
+}
+
+IN_PROC_BROWSER_TEST_F(ProfileManagerEphemeralGuestProfileBrowserTest,
+                       CleanUpEphemeralProfilesOnStartup) {
+  // If multiprofile mode is not enabled, you can't switch between profiles.
+  if (!profiles::IsMultipleProfilesEnabled())
+    return;
+
+  ProfileManager* profile_manager = g_browser_process->profile_manager();
+  ProfileAttributesStorage& storage =
+      profile_manager->GetProfileAttributesStorage();
+  // Check that ephemeral profiles got deleted.
+  EXPECT_EQ(1u, storage.GetNumberOfProfiles(true));
+}
+
 class EphemeralGuestProfilePolicyTest
     : public policy::PolicyTest,
       public ::testing::WithParamInterface<bool> {

chrome/browser/profiles/profile_manager_unittest.cc

@@ -1268,6 +1268,77 @@ TEST_F(ProfileManagerTest, CleanUpEphemeralProfiles) {
   ASSERT_EQ(0u, final_last_active_profile_list->GetSize());
 }
 
+TEST_P(ProfileManagerGuestTest, CleanUpGuestEphemeralProfile) {
+  // Create two profiles, one of them is guest.
+  ProfileManager* profile_manager = g_browser_process->profile_manager();
+  ProfileAttributesStorage& storage =
+      profile_manager->GetProfileAttributesStorage();
+  ASSERT_EQ(0u, storage.GetNumberOfProfiles());
+
+  // Create the guest profile and register it.
+  base::FilePath guest_path = ProfileManager::GetGuestProfilePath();
+  const std::string guest_profile_name = guest_path.BaseName().MaybeAsASCII();
+  TestingProfile::Builder builder;
+  builder.SetGuestSession();
+  builder.SetPath(guest_path);
+  builder.SetProfileName(guest_profile_name);
+  std::unique_ptr<TestingProfile> guest_profile = builder.Build();
+  profile_manager->RegisterTestingProfile(std::move(guest_profile), true);
+
+  // Create a regular profile.
+  const std::string profile_name = "Homer";
+  base::FilePath path =
+      profile_manager->user_data_dir().AppendASCII(profile_name);
+  storage.AddProfile(path, base::UTF8ToUTF16(profile_name), std::string(),
+                     base::UTF8ToUTF16(profile_name), true, 0, std::string(),
+                     EmptyAccountId());
+  ASSERT_TRUE(base::CreateDirectory(path));
+
+  size_t profiles_count = IsEphemeral() ? 2u : 1u;
+  ASSERT_EQ(profiles_count,
+            storage.GetNumberOfProfiles(/*include_guest_profile=*/true));
+
+  // Set the active profile.
+  PrefService* local_state = g_browser_process->local_state();
+  local_state->SetString(prefs::kProfileLastUsed, guest_profile_name);
+
+  // Set the last used profiles.
+  ListPrefUpdate update(local_state, prefs::kProfilesLastActive);
+  base::ListValue* initial_last_active_profile_list = update.Get();
+  initial_last_active_profile_list->Append(
+      std::make_unique<base::Value>(guest_path.BaseName().MaybeAsASCII()));
+  initial_last_active_profile_list->Append(
+      std::make_unique<base::Value>(path.BaseName().MaybeAsASCII()));
+
+  profile_manager->CleanUpEphemeralProfiles();
+  content::RunAllTasksUntilIdle();
+  const base::ListValue* final_last_active_profile_list =
+      local_state->GetList(prefs::kProfilesLastActive);
+
+  if (IsEphemeral()) {
+    // The ephemeral guest profile should be deleted, and the last used profile
+    // set to the other one. Also, the guest ephemeral profile should be removed
+    // from the kProfilesLastActive list.
+    EXPECT_FALSE(base::DirectoryExists(guest_path));
+    EXPECT_TRUE(base::DirectoryExists(path));
+    EXPECT_EQ(profile_name, local_state->GetString(prefs::kProfileLastUsed));
+    ASSERT_EQ(1u, storage.GetNumberOfProfiles(/*include_guest_profile=*/true));
+    ASSERT_EQ(1u, final_last_active_profile_list->GetSize());
+    ASSERT_EQ(path.BaseName().MaybeAsASCII(),
+              (final_last_active_profile_list->GetList())[0].GetString());
+  } else {
+    // The regular guest profile isn't impacted.
+    EXPECT_TRUE(base::DirectoryExists(guest_path));
+    EXPECT_TRUE(base::DirectoryExists(path));
+    EXPECT_EQ(guest_profile_name,
+              local_state->GetString(prefs::kProfileLastUsed));
+    ASSERT_EQ(1u, storage.GetNumberOfProfiles(/*include_guest_profile=*/true));
+    ASSERT_EQ(2u, final_last_active_profile_list->GetSize());
+    ASSERT_EQ(guest_path.BaseName().MaybeAsASCII(),
+              (final_last_active_profile_list->GetList())[0].GetString());
+  }
+}
+
 TEST_F(ProfileManagerTest, CleanUpEphemeralProfilesWithGuestLastUsedProfile) {
   ProfileManager* profile_manager = g_browser_process->profile_manager();
   ProfileAttributesStorage& storage =