Implement {Start,Stop}CapturingKeyStrokes for Instant.

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 2c6abc4be9a68e109be65fd1b0e59e1e7d0fdd2c..5f835f7b20307fcdde743fa0e2e1be73f8fa9f23 100644
--- a/chrome/renderer/resources/extensions/searchbox_api.js
+++ b/chrome/renderer/resources/extensions/searchbox_api.js
@@ -40,6 +40,8 @@ if (!chrome.searchBox) {
     native function SetQuery();
     native function SetQueryFromAutocompleteResult();
     native function Show();
+    native function StartCapturingKeyStrokes();
+    native function StopCapturingKeyStrokes();
 
     // Returns the |restrictedText| wrapped in a ShadowDOM.
     function SafeWrap(restrictedText) {
@@ -205,6 +207,12 @@ if (!chrome.searchBox) {
     this.navigateContentWindow = function(destination) {
       return NavigateContentWindow(destination);
     };
+    this.startCapturingKeyStrokes = function() {
+      StartCapturingKeyStrokes();
+    };
+    this.stopCapturingKeyStrokes = function() {
+      StopCapturingKeyStrokes();
+    };
     this.onchange = null;
     this.onsubmit = null;
     this.oncancel = null;