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 73bdedf58fcabace08e0edbc1156a1f8b3d81866..b9eacb530c5e13a80b8a5cadbb720e99b9ec0f4a 100644
--- a/chrome/browser/instant/instant_controller.h
+++ b/chrome/browser/instant/instant_controller.h
@@ -31,6 +31,7 @@ class PrefService;
 class Profile;
 class TabContents;
 class TemplateURL;
+struct ThemeBackgroundInfo;
 
 namespace chrome {
 class BrowserInstantController;
@@ -136,6 +137,14 @@ class InstantController {
   // the loader which will notify the renderer.
   void OnActiveTabModeChanged(chrome::search::Mode new_mode);
 
+  // The theme has changed.  Pass the message down to the loader which will
+  // notify the renderer.
+  void ThemeChanged(const ThemeBackgroundInfo& theme_info);
+
+  // The theme area height has changed.  Pass the message down to the loader
+  // which will notify the renderer.
+  void ThemeAreaHeightChanged(int height);
+
   // Returns whether the preview will be committed when the mouse or touch
   // pointer is released.
   bool commit_on_pointer_release() const;