Fixed the issue shows keyword hint when omnibox loses its focus.

chrome/browser/ui/cocoa/location_bar/location_bar_view_mac.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_UI_COCOA_LOCATION_BAR_LOCATION_BAR_VIEW_MAC_H_
 #define CHROME_BROWSER_UI_COCOA_LOCATION_BAR_LOCATION_BAR_VIEW_MAC_H_
 
 #import <Cocoa/Cocoa.h>
 #include <stddef.h>
 
 #include <memory>
 #include <string>
 
 #include "base/macros.h"
 #include "base/memory/scoped_vector.h"
 #include "base/memory/weak_ptr.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/cocoa/omnibox/omnibox_view_mac.h"
 #include "chrome/browser/ui/location_bar/location_bar.h"
 #include "chrome/browser/ui/omnibox/chrome_omnibox_edit_controller.h"
 #include "components/content_settings/core/common/content_settings_types.h"
 #include "components/prefs/pref_member.h"
 #include "components/security_state/security_state_model.h"
 #include "components/zoom/zoom_event_manager_observer.h"
+#include "components/omnibox/common/omnibox_focus_state.h"
 
 @class AutocompleteTextField;
 class CommandUpdater;
 class ContentSettingDecoration;
 class KeywordHintDecoration;
 class LocationBarDecoration;
 class LocationIconDecoration;
 class ManagePasswordsDecoration;
 class PageActionDecoration;
 class Profile;
@@ skipping 140 matching lines @@
   // an update point for interface objects that need to set their appearance
   // based on the window's theme.
   void OnThemeChanged();
 
   // ChromeOmniboxEditController:
   void UpdateWithoutTabRestore() override;
   void OnChanged() override;
   ToolbarModel* GetToolbarModel() override;
   const ToolbarModel* GetToolbarModel() const override;
   content::WebContents* GetWebContents() override;
+  void OnFocusChanged(OmniboxFocusState state) override;
 
   bool ShouldShowEVBubble() const;
 
   // Returns true if the security state decoration should be displayed. The
   // security state should only be shown for valid and invalid HTTPS states.
   bool ShouldShowSecurityState() const;
 
   NSImage* GetKeywordImage(const base::string16& keyword);
 
   // Returns the color for the vector icon in the location bar.
@@ skipping 65 matching lines @@
 
   // Returns pointers to all of the LocationBarDecorations owned by this
   // LocationBarViewMac. This helper function is used for positioning and
   // re-positioning accessibility views.
   std::vector<LocationBarDecoration*> GetDecorations();
 
   // Updates |decoration|'s accessibility view's position to match the computed
   // position the decoration will be drawn at.
   void UpdateAccessibilityViewPosition(LocationBarDecoration* decoration);
 
+  // Returns true when omnibox has focus.
+  bool HasFocus() const;
+
   std::unique_ptr<OmniboxViewMac> omnibox_view_;
 
   AutocompleteTextField* field_;  // owned by tab controller
 
   // A decoration that shows an icon to the left of the address.
   std::unique_ptr<LocationIconDecoration> location_icon_decoration_;
 
   // A decoration that shows the keyword-search bubble on the left.
   std::unique_ptr<SelectedKeywordDecoration> selected_keyword_decoration_;
 
@@ skipping 25 matching lines @@
   std::unique_ptr<KeywordHintDecoration> keyword_hint_decoration_;
 
   // The right-hand-side button to manage passwords associated with a page.
   std::unique_ptr<ManagePasswordsDecoration> manage_passwords_decoration_;
 
   Browser* browser_;
 
   // Used to change the visibility of the star decoration.
   BooleanPrefMember edit_bookmarks_enabled_;
 
+  // Used to confirm the visibility of the keyword hint decoration.
+  OmniboxFocusState focus_state_;
+
   // Indicates whether or not the location bar is currently visible.
   bool location_bar_visible_;
 
   // True if the HTTPS (non EV cert) state should be displayed on the security
   // state decoration.
   bool should_show_secure_verbose_;
 
   // True if the security state decoration should be animated for changes in
   // the security level.
   bool should_animate_security_verbose_;
 
   // True if there's enough room for the omnibox to show the security verbose.
   // If the verbose is displaying the EV cert, then this should always be true.
   bool is_width_available_for_security_verbose_;
 
   // The security level of the location bar icon.
   security_state::SecurityStateModel::SecurityLevel security_level_;
 
   // Used to schedule a task for the first run info bubble.
   base::WeakPtrFactory<LocationBarViewMac> weak_ptr_factory_;
-
   DISALLOW_COPY_AND_ASSIGN(LocationBarViewMac);
 };
 
 #endif  // CHROME_BROWSER_UI_COCOA_LOCATION_BAR_LOCATION_BAR_VIEW_MAC_H_