Add API to sync_driver::SyncService for iOS

This CL moves several methods from ProfileSyncService to
sync_driver::SyncService so that they can be called on iOS.

Review URL: https://codereview.chromium.org/1067843002

Cr-Commit-Position: refs/heads/master@{#324211}

components/sync_driver/sync_service.h

@@ -5,15 +5,29 @@
 #ifndef COMPONENTS_SYNC_DRIVER_SYNC_SERVICE_H_
 #define COMPONENTS_SYNC_DRIVER_SYNC_SERVICE_H_
 
+#include <string>
+
 #include "base/macros.h"
+#include "base/time/time.h"
+#include "components/sync_driver/data_type_encryption_handler.h"
 #include "components/sync_driver/sync_service_observer.h"
 #include "sync/internal_api/public/base/model_type.h"
 
+class GoogleServiceAuthError;
+
 namespace sync_driver {
 
-class SyncService {
+class SyncService : public sync_driver::DataTypeEncryptionHandler {
  public:
-  virtual ~SyncService() {}
+  // Used to specify the kind of passphrase with which sync data is encrypted.
+  enum PassphraseType {
+    IMPLICIT,  // The user did not provide a custom passphrase for encryption.
+               // We implicitly use the GAIA password in such cases.
+    EXPLICIT,  // The user selected the "use custom passphrase" radio button
+               // during sync setup and provided a passphrase.
+  };
+
+  ~SyncService() override {}
 
   // Whether sync is enabled by user or not. This does not necessarily mean
   // that sync is currently running (due to delayed startup, unrecoverable
@@ -44,6 +58,106 @@ class SyncService {
   // Returns true if |observer| has already been added as an observer.
   virtual bool HasObserver(const SyncServiceObserver* observer) const = 0;
 
+  // ---------------------------------------------------------------------------
+  // TODO(sync): The methods below were pulled from ProfileSyncService, and
+  // should be evaluated to see if they should stay.
+
+  // Returns true if sync is enabled/not suppressed and the user is logged in.
+  // (being logged in does not mean that tokens are available - tokens may
+  // be missing because they have not loaded yet, or because they were deleted
+  // due to http://crbug.com/121755).
+  // Virtual to enable mocking in tests.
+  // TODO(tim): Remove this? Nothing in ProfileSyncService uses it, and outside
+  // callers use a seemingly arbitrary / redundant / bug prone combination of
+  // this method, IsSyncAccessible, and others.
+  virtual bool IsSyncEnabledAndLoggedIn() = 0;
+
+  // Disables sync for user. Use ShowLoginDialog to enable.
+  virtual void DisableForUser() = 0;
+
+  // Stops the sync backend and sets the flag for suppressing sync startup.
+  virtual void StopAndSuppress() = 0;
+
+  // Resets the flag for suppressing sync startup and starts the sync backend.
+  virtual void UnsuppressAndStart() = 0;
+
+  // Returns the set of types which are preferred for enabling. This is a
+  // superset of the active types (see GetActiveDataTypes()).
+  virtual syncer::ModelTypeSet GetPreferredDataTypes() const = 0;
+
+  // Called when a user chooses which data types to sync as part of the sync
+  // setup wizard.  |sync_everything| represents whether they chose the
+  // "keep everything synced" option; if true, |chosen_types| will be ignored
+  // and all data types will be synced.  |sync_everything| means "sync all
+  // current and future data types."
+  virtual void OnUserChoseDatatypes(bool sync_everything,
+                                    syncer::ModelTypeSet chosen_types) = 0;
+
+  // Called whe Sync has been setup by the user and can be started.
+  virtual void SetSyncSetupCompleted() = 0;
+
+  // Returns true if initial sync setup is in progress (does not return true
+  // if the user is customizing sync after already completing setup once).
+  // SyncService uses this to determine if it's OK to start syncing, or if the
+  // user is still setting up the initial sync configuration.
+  virtual bool FirstSetupInProgress() const = 0;
+
+  // Called by the UI to notify the SyncService that UI is visible so it will
+  // not start syncing. This tells sync whether it's safe to start downloading
+  // data types yet (we don't start syncing until after sync setup is complete).
+  // The UI calls this as soon as any part of the signin wizard is displayed
+  // (even just the login UI).
+  // If |setup_in_progress| is false, this also kicks the sync engine to ensure
+  // that data download starts. In this case, |ReconfigureDatatypeManager| will
+  // get triggered.
+  virtual void SetSetupInProgress(bool setup_in_progress) = 0;
+
+  // Used by tests.
+  virtual bool setup_in_progress() const = 0;
+
+  // Whether the data types active for the current mode have finished
+  // configuration.
+  virtual bool ConfigurationDone() const = 0;
+
+  virtual const GoogleServiceAuthError& GetAuthError() const = 0;
+  virtual bool HasUnrecoverableError() const = 0;
+
+  // Returns true if the SyncBackendHost has told us it's ready to accept
+  // changes. This should only be used for sync's internal configuration logic
+  // (such as deciding when to prompt for an encryption passphrase).
+  virtual bool backend_initialized() const = 0;
+
+  // Returns true if OnPassphraseRequired has been called for decryption and
+  // we have an encrypted data type enabled.
+  virtual bool IsPassphraseRequiredForDecryption() const = 0;
+
+  // Returns the time the current explicit passphrase (if any), was set.
+  // If no secondary passphrase is in use, or no time is available, returns an
+  // unset base::Time.
+  virtual base::Time GetExplicitPassphraseTime() const = 0;
+
+  // Returns true if a secondary (explicit) passphrase is being used. It is not
+  // legal to call this method before the backend is initialized.
+  virtual bool IsUsingSecondaryPassphrase() const = 0;
+
+  // Turns on encryption for all data. Callers must call OnUserChoseDatatypes()
+  // after calling this to force the encryption to occur.
+  virtual void EnableEncryptEverything() = 0;
+
+  // Asynchronously sets the passphrase to |passphrase| for encryption. |type|
+  // specifies whether the passphrase is a custom passphrase or the GAIA
+  // password being reused as a passphrase.
+  // TODO(atwilson): Change this so external callers can only set an EXPLICIT
+  // passphrase with this API.
+  virtual void SetEncryptionPassphrase(const std::string& passphrase,
+                                       PassphraseType type) = 0;
+
+  // Asynchronously decrypts pending keys using |passphrase|. Returns false
+  // immediately if the passphrase could not be used to decrypt a locally cached
+  // copy of encrypted keys; returns true otherwise.
+  virtual bool SetDecryptionPassphrase(const std::string& passphrase)
+      WARN_UNUSED_RESULT = 0;
+
  protected:
   SyncService() {}