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 66e9751b8c188a0aba757c67e6dc6b62ee936b22..2bf4d96286242a9ad67aa8e395cc4de16778254d 100644
--- a/chrome/renderer/resources/extensions/searchbox_api.js
+++ b/chrome/renderer/resources/extensions/searchbox_api.js
@@ -39,6 +39,8 @@ 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) {
@@ -203,6 +205,12 @@ 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;