Implement {Start,Stop}CapturingKeyStrokes for Instant.

chrome/browser/ui/omnibox/omnibox_view.h

Index: chrome/browser/ui/omnibox/omnibox_view.h
diff --git a/chrome/browser/ui/omnibox/omnibox_view.h b/chrome/browser/ui/omnibox/omnibox_view.h
index 692144f48fc5aeb8585e4c18ccab27b1dd8c29a8..7f21b56c4a8e9fa0caa70870c4d0726df26614ff 100644
--- a/chrome/browser/ui/omnibox/omnibox_view.h
+++ b/chrome/browser/ui/omnibox/omnibox_view.h
@@ -152,6 +152,10 @@ class OmniboxView {
   // Sets the focus to the autocomplete view.
   virtual void SetFocus() = 0;
 
+  // Shows or hides the caret based on whether the model's is_caret_visible() is
+  // true.
+  virtual void ApplyCaretVisibility() = 0;
+
   // Called when the temporary text in the model may have changed.
   // |display_text| is the new text to show; |save_original_selection| is true
   // when there wasn't previously a temporary text and thus we need to save off