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 2327b27d3e6745103154f664b8e545f38e237e72..dad3aaefc4edc07f23d6d854e1bb926341575ba8 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_; }