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diff --git a/chrome/browser/sync/glue/theme_util.h b/chrome/browser/sync/glue/theme_util.h
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+++ b/chrome/browser/sync/glue/theme_util.h
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+// Copyright (c) 2010 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_SYNC_GLUE_THEME_UTIL_H_
+#define CHROME_BROWSER_SYNC_GLUE_THEME_UTIL_H_
+
+class Extension;
+class Profile;
+
+namespace sync_pb {
+class ThemeSpecifics;
+}  // sync_pb
+
+namespace browser_sync {
+
+extern const char kCurrentThemeClientTag[];
+
+// Returns true iff two ThemeSpecifics indicate the same theme.
+bool AreThemeSpecificsEqual(const sync_pb::ThemeSpecifics& a,
+                            const sync_pb::ThemeSpecifics& b);
+
+// Exposed only for testing.
+bool AreThemeSpecificsEqualHelper(
+    const sync_pb::ThemeSpecifics& a,
+    const sync_pb::ThemeSpecifics& b,
+    bool is_system_theme_distinct_from_default_theme);
+
+// Sets the current theme from the information in the given
+// ThemeSpecifics.
+void SetCurrentThemeFromThemeSpecifics(
+    const sync_pb::ThemeSpecifics& theme_specifics,
+    Profile* profile);
+
+// Sets all fields of the given ThemeSpecifics according to the
+// current theme.
+void GetThemeSpecificsFromCurrentTheme(
+    Profile* profile,
+    sync_pb::ThemeSpecifics* theme_specifics);
+
+// Exposed only for testing.
+void GetThemeSpecificsFromCurrentThemeHelper(
+    const Extension* current_theme,
+    bool is_system_theme_distinct_from_default_theme,
+    bool use_system_theme_by_default,
+    sync_pb::ThemeSpecifics* theme_specifics);
+
+// Like SetChrrentThemeFromThemeSpecifics() except does nothing if the
+// current theme is equivalent to that described by theme_specifics.
+void SetCurrentThemeFromThemeSpecificsIfNecessary(
+    const sync_pb::ThemeSpecifics& theme_specifics, Profile* profile);
+
+// Like SetCurrentThemeFromThemeSpecifics() except that in the case where
+// |theme_specifics| uses the default theme and |profile| does not, the local
+// data "wins" against the server's and |theme_specifics| is updated with the
+// custom theme. Returns true iff |theme_specifics| is updated.
+bool UpdateThemeSpecificsOrSetCurrentThemeIfNecessary(
+    Profile* profile, sync_pb::ThemeSpecifics* theme_specifics);
+
+}  // namespace browser_sync
+
+#endif  // CHROME_BROWSER_SYNC_GLUE_THEME_UTIL_H_