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

chrome/browser/instant/instant_loader.h

Index: chrome/browser/instant/instant_loader.h
diff --git a/chrome/browser/instant/instant_loader.h b/chrome/browser/instant/instant_loader.h
index 3837b87997eaadbe2a79ba4f47a75b88b2225371..8893dd6ecf520a82825c3b7f2486218aaa707140 100644
--- a/chrome/browser/instant/instant_loader.h
+++ b/chrome/browser/instant/instant_loader.h
@@ -60,9 +60,13 @@ class InstantLoader : public content::NotificationObserver {
   // is taken as the exact query (no prediction is made).
   void Update(const string16& user_text, bool verbatim);
 
-  // Tells the preview page of the bounds of the omnibox dropdown (in screen
+  // Tells the preview page of the bounds of the omnibox popup (in screen
   // coordinates). This is used by the page to offset the results to avoid them
   // being covered by the omnibox dropdown.
+  void SetPopupBounds(const gfx::Rect& bounds);
+
+  // Tells the preview page of the bounds of the omnibox itself in screen
+  // coordinates. This is used by the page to determine page margin widths.
   void SetOmniboxBounds(const gfx::Rect& bounds);
 
   // Tells the preview page about the available autocomplete results.