alternate ntp: implement searchbox api for instant overlay to adopt themes

chrome/browser/instant/instant_controller.h

Index: chrome/browser/instant/instant_controller.h
diff --git a/chrome/browser/instant/instant_controller.h b/chrome/browser/instant/instant_controller.h
index 7c9f11c834bf9191966b2bb3bd1ce88cf990caac..a8a469d9b2c5b5c0df7aca1e8b1ae05138b4e345 100644
--- a/chrome/browser/instant/instant_controller.h
+++ b/chrome/browser/instant/instant_controller.h
@@ -30,6 +30,7 @@ class PrefService;
 class Profile;
 class TabContents;
 class TemplateURL;
+struct ThemeBackgroundInfo;
 
 namespace chrome {
 class BrowserInstantController;
@@ -135,6 +136,14 @@ class InstantController {
   // loader which will notify the renderer.
   void OnActiveTabModeChanged(bool active_tab_is_ntp);
 
+  // The theme has changed.  Pass the message down to the loader which will
+  // notify the renderer.
+  void OnThemeChanged(const ThemeBackgroundInfo& theme_info);
+
+  // The theme area height has changed.  Pass the message down to the loader
+  // which will notify the renderer.
+  void OnThemeAreaHeightChanged(int height);
+
   // Returns whether the preview will be committed when the mouse or touch
   // pointer is released.
   bool commit_on_pointer_release() const;