Implement {Start,Stop}CapturingKeyStrokes for Instant.

chrome/renderer/searchbox/searchbox.cc

Index: chrome/renderer/searchbox/searchbox.cc
diff --git a/chrome/renderer/searchbox/searchbox.cc b/chrome/renderer/searchbox/searchbox.cc
index f5ff4b1ece0eb5cdc4894a3ef017bb946bdbb36c..20814183502b199b08bb796d19ab1515ee39d250 100644
--- a/chrome/renderer/searchbox/searchbox.cc
+++ b/chrome/renderer/searchbox/searchbox.cc
@@ -36,6 +36,11 @@ void SearchBox::SetSuggestions(
       render_view()->GetRoutingID(), render_view()->GetPageId(), suggestions));
 }
 
+void SearchBox::OnWebSearchBoxFocusChange(bool is_focused) {
+  render_view()->Send(new ChromeViewHostMsg_OnWebSearchBoxFocusChange(
+      render_view()->GetRoutingID(), render_view()->GetPageId(), is_focused));
+}
+
 void SearchBox::ShowInstantPreview(InstantShownReason reason,
                                    int height,
                                    InstantSizeUnits units) {