Add onfocuschange to the Extended Search API, with associated isFocused attribute.

chrome/browser/ui/search/instant_page.cc

Index: chrome/browser/ui/search/instant_page.cc
diff --git a/chrome/browser/ui/search/instant_page.cc b/chrome/browser/ui/search/instant_page.cc
index ce3fc9f81a55ba64f807a46f56915814a22f15b1..e95fd04a09623bffa0f3bbfd0cd42f7264fa93d3 100644
--- a/chrome/browser/ui/search/instant_page.cc
+++ b/chrome/browser/ui/search/instant_page.cc
@@ -118,6 +118,10 @@ void InstantPage::SendMostVisitedItems(
   Send(new ChromeViewMsg_SearchBoxMostVisitedItemsChanged(routing_id(), items));
 }
 
+void InstantPage::FocusChanged(bool is_focused) {
+  Send(new ChromeViewMsg_SearchBoxFocusChanged(routing_id(), is_focused));
+}
+
 InstantPage::InstantPage(Delegate* delegate, const std::string& instant_url)
     : delegate_(delegate),
       instant_url_(instant_url),