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 1ca7e76494e00cb18091ca95520ec9f18038f2f0..151485f4636dea2bbdc461082fb3449bfdb0be14 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;
 var onvisibilitycalls = 0;
 
 function getApiHandle() {
@@ -105,6 +107,11 @@ document.addEventListener("webkitvisibilitychange", function() {
   onvisibilitycalls++;
 }, false);
 
+function handleFocusChange() {
+  onFocusChangedCalls++;
+  isFocused = apiHandle.isFocused;
+}
+
 function setUp() {
   apiHandle = getApiHandle();
   if (!apiHandle)
@@ -115,6 +122,7 @@ function setUp() {
   apiHandle.onsubmit = handleSubmit;
   apiHandle.onchange = handleOnChange;
   apiHandle.onkeypress = handleKeyPress;
+  apiHandle.onfocuschange = handleFocusChange;
   newTabPageHandle.onmostvisitedchange = handleMostVisitedChange;
   if (apiHandle.value) {
     handleNativeSuggestions();
@@ -123,6 +131,7 @@ function setUp() {
   if (newTabPageHandle.mostVisited && newTabPageHandle.mostVisited.length) {
     handleMostVisitedChange();
   }
+  handleFocusChange();
 }
 
 setUp();