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

chrome/renderer/resources/extensions/searchbox_api.js

Index: chrome/renderer/resources/extensions/searchbox_api.js
diff --git a/chrome/renderer/resources/extensions/searchbox_api.js b/chrome/renderer/resources/extensions/searchbox_api.js
index bfc8405393304826956f1723304e610372783775..2a3f51b835fc3571bf6c2425eba68039372e54eb 100644
--- a/chrome/renderer/resources/extensions/searchbox_api.js
+++ b/chrome/renderer/resources/extensions/searchbox_api.js
@@ -94,6 +94,7 @@ if (!chrome.embeddedSearch) {
       native function GetAutocompleteResults();
       native function GetDisplayInstantResults();
       native function GetFontSize();
+      native function IsFocused();
       native function IsKeyCaptureEnabled();
       native function SetQuery();
       native function SetQueryFromAutocompleteResult();
@@ -229,6 +230,7 @@ if (!chrome.embeddedSearch) {
       this.__defineGetter__('startMargin', GetStartMargin);
       this.__defineGetter__('rtl', GetRightToLeft);
       this.__defineGetter__('nativeSuggestions', GetAutocompleteResultsWrapper);
+      this.__defineGetter__('isFocused', IsFocused);
       this.__defineGetter__('isKeyCaptureEnabled', IsKeyCaptureEnabled);
       this.__defineGetter__('displayInstantResults', GetDisplayInstantResults);
       this.__defineGetter__('font', GetFont);
@@ -295,6 +297,7 @@ if (!chrome.embeddedSearch) {
       this.onmarginchange = null;
       this.onnativesuggestions = null;
       this.onbarshidden = null;
+      this.onfocuschange = null;
 
       // DEPRECATED. These methods are from the legacy searchbox API.
       // TODO(jered): Delete these.