Moved theme related state from BrowserInstantController to InstantService.

chrome/browser/search/instant_service_observer.h

Index: chrome/browser/search/instant_service_observer.h
diff --git a/chrome/browser/search/instant_service_observer.h b/chrome/browser/search/instant_service_observer.h
new file mode 100644
index 0000000000000000000000000000000000000000..d5319ed8c1516fe4a9014d18eb171ad1561db98f
--- /dev/null
+++ b/chrome/browser/search/instant_service_observer.h
@@ -0,0 +1,20 @@
+// 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_