Moved theme related state from BrowserInstantController to InstantService.

chrome/browser/search/instant_service_observer.h

+// Copyright 2013 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_SEARCH_INSTANT_SERVICE_OBSERVER_H_
+#define CHROME_BROWSER_SEARCH_INSTANT_SERVICE_OBSERVER_H_
+
+struct ThemeBackgroundInfo;
+
+// InstantServiceObserver defines the observer interface for InstantService.
+class InstantServiceObserver {
+ public:
+  // Indicates that the user's custom theme has changed in some way.
+  virtual void ThemeInfoChanged(const ThemeBackgroundInfo&) = 0;
+
+ protected:
+  virtual ~InstantServiceObserver() {}
+};
+
+#endif  // CHROME_BROWSER_SEARCH_INSTANT_SERVICE_OBSERVER_H_