[sync] Automatic bootstrapping of Sync on Win 8 from cached credentials

chrome/browser/sync/profile_sync_service.cc

Index: chrome/browser/sync/profile_sync_service.cc
diff --git a/chrome/browser/sync/profile_sync_service.cc b/chrome/browser/sync/profile_sync_service.cc
index 7fa28b89d5b21eead6ff2fe2cc757b6a56e3e707..1b0bc3ac31323e99a5309546d8ebbeb9b081ea8d 100644
--- a/chrome/browser/sync/profile_sync_service.cc
+++ b/chrome/browser/sync/profile_sync_service.cc
@@ -21,6 +21,9 @@
 #include "base/string16.h"
 #include "base/stringprintf.h"
 #include "base/threading/thread_restrictions.h"
+#if defined(OS_WIN)
+#include "base/win/windows_version.h"
+#endif
 #include "chrome/browser/about_flags.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/defaults.h"
@@ -31,6 +34,8 @@
 #include "chrome/browser/signin/token_service.h"
 #include "chrome/browser/signin/token_service_factory.h"
 #include "chrome/browser/sync/backend_migrator.h"
+#include "chrome/browser/sync/credential_cache_service_factory_win.h"
+#include "chrome/browser/sync/credential_cache_service_win.h"
 #include "chrome/browser/sync/glue/change_processor.h"
 #include "chrome/browser/sync/glue/chrome_encryptor.h"
 #include "chrome/browser/sync/glue/chrome_report_unrecoverable_error.h"
@@ -69,6 +74,8 @@ using browser_sync::ChangeProcessor;
 using browser_sync::DataTypeController;
 using browser_sync::DataTypeManager;
 using browser_sync::SyncBackendHost;
+using syncer::CredentialCacheService;
+using syncer::CredentialCacheServiceFactory;
 using syncer::ModelType;
 using syncer::ModelTypeSet;
 using syncer::JsBackend;
@@ -139,7 +146,8 @@ ProfileSyncService::ProfileSyncService(ProfileSyncComponentsFactory* factory,
       auto_start_enabled_(start_behavior == AUTO_START),
       failed_datatypes_handler_(ALLOW_THIS_IN_INITIALIZER_LIST(this)),
       configure_status_(DataTypeManager::UNKNOWN),
-      setup_in_progress_(false) {
+      setup_in_progress_(false),
+      credential_cache_service_(NULL) {
 #if defined(OS_ANDROID)
   chrome::VersionInfo version_info;
   if (version_info.IsOfficialBuild()) {
@@ -205,12 +213,28 @@ void ProfileSyncService::Initialize() {
     DisableForUser();
   }
 
+#if defined(OS_WIN)
+  // Initialize the CredentialCacheService for the default profile on Windows 8.
+  if (base::win::GetVersion() >= base::win::VERSION_WIN8 &&
+      CredentialCacheService::IsDefaultProfileDir(profile()->GetPath()) &&
+      !sync_prefs_.IsStartSuppressed()) {
+    credential_cache_service_ =
+        CredentialCacheServiceFactory::GetInstance()->GetForProfile(profile_);
+  }
+#endif  // OS_WIN
+
   TryStart();
 }
 
 void ProfileSyncService::TryStart() {
-  if (!IsSyncEnabledAndLoggedIn())
+  if (!IsSyncEnabledAndLoggedIn()) {
+#if defined(OS_WIN)
+    if (credential_cache_service_)
+      credential_cache_service_->LookForCachedCredentialsInAlternateProfile();
+#endif  // OS_WIN
     return;
+  }
+
   TokenService* token_service = TokenServiceFactory::GetForProfile(profile_);
   if (!token_service)
     return;