Implement the Instant extended API startMargin, endMargin, and rtl properties and the onmarginchang…

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 0cbaa8e7e3f2248a24bdeeedf659efaa4368533b..59dce3468bdba75d187421bcb722d5ad915ad108 100644
--- a/chrome/browser/ui/browser_instant_controller.h
+++ b/chrome/browser/ui/browser_instant_controller.h
@@ -84,6 +84,9 @@ class BrowserInstantController : public content::NotificationObserver,
   // Invoked by |instant_| to update theme information for preview.
   void UpdateThemeInfoForPreview();
 
+  // Sets the start and end margins of the omnibox text area.
+  void SetMarginSize(int start, int end);
+
  private:
   // Sets the value of |instant_| based on value from profile. Invoked
   // on pref change.