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

chrome/browser/ui/browser_instant_controller.h

Index: chrome/browser/ui/browser_instant_controller.h
diff --git a/chrome/browser/ui/browser_instant_controller.h b/chrome/browser/ui/browser_instant_controller.h
index 90fe98197b67147da457a8494dfeb41906c3f06d..f672bf19ddcc611c80467c51a94d0707aefda983 100644
--- a/chrome/browser/ui/browser_instant_controller.h
+++ b/chrome/browser/ui/browser_instant_controller.h
@@ -15,6 +15,8 @@
 #include "chrome/browser/ui/search/search_model_observer.h"
 #include "chrome/browser/ui/tabs/tab_strip_model_observer.h"
 #include "chrome/common/instant_types.h"
+#include "content/public/browser/notification_observer.h"
+#include "content/public/browser/notification_registrar.h"
 #include "webkit/glue/window_open_disposition.h"
 
 class Browser;
@@ -26,11 +28,16 @@ namespace gfx {
 class Rect;
 }
 
+namespace ui {
+class ThemeProvider;
+};
+
 namespace chrome {
 
 class BrowserInstantController : public TabStripModelObserver,
                                  public search::SearchModelObserver,
-                                 public PrefObserver {
+                                 public PrefObserver,
+                                 public content::NotificationObserver {
  public:
   explicit BrowserInstantController(Browser* browser);
   virtual ~BrowserInstantController();
@@ -62,6 +69,14 @@ class BrowserInstantController : public TabStripModelObserver,
   // preview would be shown.
   TabContents* GetActiveTabContents() const;
 
+  // Invoked by |BrowserWindow| during layout to set content height which is
+  // used as theme area height, i.e. the height of the area that the entire
+  // theme background image should fill up.
+  void SetContentHeight(int height);
+
+  // Invoked by |instant_| to update theme-related information in preview.
+  void UpdateThemeRelatedInfoForPreview();
+
   // Overridden from PrefObserver:
   virtual void OnPreferenceChanged(PrefServiceBase* service,
                                    const std::string& pref_name) OVERRIDE;
@@ -78,17 +93,35 @@ class BrowserInstantController : public TabStripModelObserver,
                            const search::Mode& new_mode) OVERRIDE;
 
  private:
+  // content::NotificationObserver implementation.
+  virtual void Observe(int type,
+                       const content::NotificationSource& source,
+                       const content::NotificationDetails& details) OVERRIDE;
+
   // If this browser should have Instant, a new InstantController created;
   // otherwise any existing InstantController is destroyed.
   void ResetInstant();
 
+  // Helper for handling theme change.
+  void OnThemeChanged(ui::ThemeProvider* theme_provider);
+
+  // Helper for handling theme area height change.
+  void OnThemeAreaHeightChanged(int height);
+
   Browser* browser_;
 
   scoped_ptr<InstantController> instant_;
   InstantUnloadHandler instant_unload_handler_;
 
+  // Theme-related data for NTP preview to adopt themes.
+  ThemeBackgroundInfo theme_info_;
+  int theme_image_alignment_;
+  int theme_area_height_;
+
   PrefChangeRegistrar profile_pref_registrar_;
 
+  content::NotificationRegistrar registrar_;
+
   DISALLOW_COPY_AND_ASSIGN(BrowserInstantController);
 };