Implement {Start,Stop}CapturingKeyStrokes for Instant.

chrome/renderer/searchbox/searchbox.h

Index: chrome/renderer/searchbox/searchbox.h
diff --git a/chrome/renderer/searchbox/searchbox.h b/chrome/renderer/searchbox/searchbox.h
index 406bf4a3ecbefc8d6507a46357e0696c6da3e52f..6c18729e8e9727b604c8c35b1b35ab4321fc06cf 100644
--- a/chrome/renderer/searchbox/searchbox.h
+++ b/chrome/renderer/searchbox/searchbox.h
@@ -33,6 +33,12 @@ class SearchBox : public content::RenderViewObserver,
                           int height,
                           InstantSizeUnits units);
 
+  // Sends ViewHostMsg_StartCapturingKeyStrokes to the browser.
+  void StartCapturingKeyStrokes();
+
+  // Sends ViewHostMsg_StopCapturingKeyStrokes to the browser.
+  void StopCapturingKeyStrokes();
+
   const string16& query() const { return query_; }
   bool verbatim() const { return verbatim_; }
   size_t selection_start() const { return selection_start_; }