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diff --git a/chrome/browser/views/sync/sync_setup_wizard.h b/chrome/browser/views/sync/sync_setup_wizard.h
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+++ b/chrome/browser/views/sync/sync_setup_wizard.h
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+// Copyright (c) 2006-2008 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_VIEWS_SYNC_SYNC_SETUP_WIZARD_H_
+#define CHROME_BROWSER_VIEWS_SYNC_SYNC_SETUP_WIZARD_H_
+
+#include "base/basictypes.h"
+
+#if defined(OS_WIN)
+class SyncSetupFlowContainer;
+#elif defined(OS_LINUX)
+typedef struct _GtkWidget GtkWidget;
+typedef struct _GtkWindow GtkWindow;
+#endif
+
+class ProfileSyncService;
+
+class SyncSetupWizard {
+ public:
+  enum State {
+    // Show the Google Account login UI.
+    GAIA_LOGIN = 0,
+    // A login attempt succeeded.  Depending on initial conditions, this may
+    // cause a transition to DONE, or to wait for an explicit transition (via
+    // Step) to the next state.
+    GAIA_SUCCESS,
+    // The user needs to accept a merge and sync warning to proceed.
+    MERGE_AND_SYNC,
+    // The panic switch.  Something went terribly wrong during setup and we
+    // can't recover.
+    FATAL_ERROR,
+    // A final state for when setup completes and it is possible it is the
+    // user's first time (globally speaking) as the cloud doesn't have any
+    // bookmarks.  We show additional info in this case to explain setting up
+    // more computers.
+    DONE_FIRST_TIME,
+    // A catch-all done case for any setup process.
+    DONE
+  };
+
+  explicit SyncSetupWizard(ProfileSyncService* service);
+  ~SyncSetupWizard();
+
+  // Advances the wizard to the specified state if possible, or opens a
+  // new dialog starting at |advance_state|.  If the wizard has never ran
+  // through to completion, it will always attempt to do so.  Otherwise, e.g
+  // for a transient auth failure, it will just run as far as is necessary
+  // based on |advance_state| (so for auth failure, up to GAIA_SUCCESS).
+  void Step(State advance_state);
+
+  // Whether or not a dialog is currently showing.  Useful to determine
+  // if various buttons in the UI should be enabled or disabled.
+  bool IsVisible() const;
+
+#if defined(OS_LINUX)
+  void SetVisible(bool visible) { visible_ = visible; }
+#endif
+
+ private:
+  // If we just need to pop open an individual dialog, say to collect
+  // gaia credentials in the event of a steady-state auth failure, this is
+  // a "discrete" run (as in not a continuous wizard flow).  This returns
+  // the end state to pass to Run for a given |start_state|.
+  static State GetEndStateForDiscreteRun(State start_state);
+
+  // Helper to return whether |state| warrants starting a new flow.
+  static bool IsTerminalState(State state);
+
+  ProfileSyncService* service_;
+
+#if defined(OS_WIN)
+  SyncSetupFlowContainer* flow_container_;
+#elif defined(OS_LINUX)
+  bool visible_;
+#endif
+
+  DISALLOW_COPY_AND_ASSIGN(SyncSetupWizard);
+};
+
+#endif  // CHROME_BROWSER_VIEWS_SYNC_SYNC_SETUP_WIZARD_H_