Implement {Start,Stop}CapturingKeyStrokes for Instant.

chrome/browser/ui/omnibox/omnibox_edit_model.h

Index: chrome/browser/ui/omnibox/omnibox_edit_model.h
diff --git a/chrome/browser/ui/omnibox/omnibox_edit_model.h b/chrome/browser/ui/omnibox/omnibox_edit_model.h
index 6caf62f542932a94b4d3cbe564454c88cc6574c4..6d2da23fbc27543220e3c93435d5275890ee6e09 100644
--- a/chrome/browser/ui/omnibox/omnibox_edit_model.h
+++ b/chrome/browser/ui/omnibox/omnibox_edit_model.h
@@ -191,6 +191,8 @@ class OmniboxEditModel : public AutocompleteControllerDelegate {
 
   bool has_focus() const { return has_focus_; }
 
+  bool is_focus_visible() const { return is_focus_visible_; }
+
   // Accessors for keyword-related state (see comments on keyword_ and
   // is_keyword_hint_).
   const string16& keyword() const { return keyword_; }
@@ -213,6 +215,11 @@ class OmniboxEditModel : public AutocompleteControllerDelegate {
   // control key is down (at the time we're gaining focus).
   void OnSetFocus(bool control_down);
 
+  // Called when we switch between using visible and invisible focus for the
+  // omnibox. NOTE: this does NOT convey whether the view currently has focus;
+  // only whether the focus will be visible when it does gain focus.
+  void OnFocusVisibilityChange(bool visible_focus);
+
   // Sent before |OnKillFocus| and before the popup is closed.
   void OnWillKillFocus(gfx::NativeView view_gaining_focus);
 
@@ -404,6 +411,9 @@ class OmniboxEditModel : public AutocompleteControllerDelegate {
   // Whether the edit has focus.
   bool has_focus_;
 
+  // Will the focus be visible?
+  bool is_focus_visible_;
+
   // The URL of the currently displayed page.
   string16 permanent_text_;