Make keyword hint view ("press tab to search foo.com") clickable.

chrome/browser/ui/views/location_bar/keyword_hint_view.h

 // Copyright (c) 2011 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_VIEWS_LOCATION_BAR_KEYWORD_HINT_VIEW_H_
 #define CHROME_BROWSER_UI_VIEWS_LOCATION_BAR_KEYWORD_HINT_VIEW_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "ui/gfx/geometry/size.h"
-#include "ui/views/view.h"
+#include "ui/views/controls/button/custom_button.h"
 
 class Profile;
 
 namespace gfx {
 class FontList;
 }
 
 namespace views {
 class Label;
 }
 
 // KeywordHintView is used by the location bar view to display a hint to the
-// user when the selected url has a corresponding keyword.
+// user that pressing Tab will enter tab to search mode. The view is also
+// clickable, which has the same effect as pressing tab.
 //
 // Internally KeywordHintView uses two labels to render the text, and draws
 // the tab image itself.
 //
 // NOTE: This should really be called LocationBarKeywordHintView, but I
 // couldn't bring myself to use such a long name.
-class KeywordHintView : public views::View {
+class KeywordHintView : public views::CustomButton {
  public:
-  KeywordHintView(Profile* profile,
+  KeywordHintView(views::ButtonListener* listener,
+                  Profile* profile,
                   const gfx::FontList& font_list,
                   const gfx::FontList& bubble_font_list,
                   int tab_key_height,
                   SkColor text_color,
                   SkColor background_color);
   ~KeywordHintView() override;
 
   void SetKeyword(const base::string16& keyword);
   base::string16 keyword() const { return keyword_; }
 
@@ skipping 17 matching lines @@
 
   // Height of the tab key view.
   int tab_key_height_;
 
   base::string16 keyword_;
 
   DISALLOW_COPY_AND_ASSIGN(KeywordHintView);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_LOCATION_BAR_KEYWORD_HINT_VIEW_H_