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..8f10503b1546e4e5924236758b0e1dc2d48cb37c 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;
 
+  // Styles the omnibox according to the visibility of the focus stored in the

[Peter Kasting, 2012/12/04 02:00:52]

Nit: Awkward... how about "Shows or hides the caret based on whether the model's
is_focus_visible() is true."

[samarth, 2012/12/04 04:55:35]

Done.

+  // OmniboxEditModel. Should only be called by the model.
+  virtual void ApplyFocusVisibility() = 0;

[Peter Kasting, 2012/12/04 02:00:52]

Nit: Should we maybe call all these functions (in view and model?) "set caret
visibility" (etc.) instead of "set focus visibility"?  After all, we're really
just changing whether the caret is visible.

[samarth, 2012/12/04 04:55:35]

Done.

+
   // 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