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 c6def6c7d0df890c55db597a0c8bc30332bc58bd..8705cf36f394876b8d7cd4640c7954f664a64a27 100644
--- a/chrome/browser/instant/instant_controller.h
+++ b/chrome/browser/instant/instant_controller.h
@@ -29,6 +29,7 @@ class AutocompleteProvider;
 class InstantLoader;
 class TabContents;
 class TemplateURL;
+struct ThemeBackgroundInfo;
 
 namespace chrome {
 class BrowserInstantController;
@@ -98,6 +99,14 @@ class InstantController {
   // Sets whether Instant should show result previews.
   void SetInstantEnabled(bool instant_enabled);
 
+  // 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 the transition type of the last AutocompleteMatch passed to Update.
   content::PageTransition last_transition_type() const {
     return last_transition_type_;