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

chrome/test/data/instant_extended.html

Index: chrome/test/data/instant_extended.html
diff --git a/chrome/test/data/instant_extended.html b/chrome/test/data/instant_extended.html
index feb45abd45f8f7e1d2fcbb7b1e00d13233f225a1..9fdffceacb55dd0c7a8994f4c48fefc1fca3259a 100644
--- a/chrome/test/data/instant_extended.html
+++ b/chrome/test/data/instant_extended.html
@@ -17,6 +17,8 @@ var onNativeSuggestionsCalls = 0;
 var onChangeCalls = 0;
 var submitCount = 0;
 var onEscKeyPressedCalls = 0;
+var onFocusChangedCalls = 0;
+var isFocused = false;
 
 function getApiHandle() {
   if (window.navigator && window.navigator.searchBox)
@@ -100,6 +102,11 @@ function handleMostVisitedChange() {
   }
 }
 
+function handleFocusChange() {
+  onFocusChangedCalls++;
+  isFocused = apiHandle.isFocused;
+}
+
 function setUp() {
   apiHandle = getApiHandle();
   if (!apiHandle)
@@ -110,6 +117,7 @@ function setUp() {
   apiHandle.onsubmit = handleSubmit;
   apiHandle.onchange = handleOnChange;
   apiHandle.onkeypress = handleKeyPress;
+  apiHandle.onfocuschange = handleFocusChange;
   newTabPageHandle.onmostvisitedchange = handleMostVisitedChange;
   if (apiHandle.value) {
     handleNativeSuggestions();