Use ink drop hover for focus states on toolbar buttons and location

ui/views/controls/button/md_text_button.h

 // Copyright 2015 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 UI_VIEWS_CONTROLS_BUTTON_MD_TEXT_BUTTON_H_
 #define UI_VIEWS_CONTROLS_BUTTON_MD_TEXT_BUTTON_H_
 
 #include <memory>
 
 #include "ui/views/animation/button_ink_drop_delegate.h"
@@ skipping 18 matching lines @@
                                            const base::string16& text);
   // As above, but only creates an MdTextButton if MD is enabled in the
   // secondary UI (as opposed to just "top chrome"/"primary" UI).
   static LabelButton* CreateSecondaryUiButton(ButtonListener* listener,
                                               const base::string16& text);
   static LabelButton* CreateSecondaryUiBlueButton(ButtonListener* listener,
                                                   const base::string16& text);
   static MdTextButton* CreateMdButton(ButtonListener* listener,
                                       const base::string16& text);
 
+  // Paint an MD-style focus ring on the given canvas at the given bounds.
+  static void PaintMdFocusRing(gfx::Canvas* canvas, View* view);
+
   void SetCallToAction(CallToAction cta);
 
   // LabelButton:
+  void Layout() override;
+  void OnFocus() override;
+  void OnBlur() override;
   void OnNativeThemeChanged(const ui::NativeTheme* theme) override;
   SkColor GetInkDropBaseColor() const override;
+  bool ShouldShowInkDropForFocus() const override;
   void SetText(const base::string16& text) override;
   void UpdateStyleToIndicateDefaultStatus() override;
 
  private:
   MdTextButton(ButtonListener* listener);
   ~MdTextButton() override;
 
   void UpdateColorsFromNativeTheme();
 
-  ButtonInkDropDelegate ink_drop_delegate_;
+  // The MD-style focus ring. This is not done via a FocusPainter
+  // because it needs to paint to a layer so it can extend beyond the bounds of
+  // |this|.
+  views::View* focus_ring_;
 
   // The call to action style for this button.
   CallToAction cta_;
 
   DISALLOW_COPY_AND_ASSIGN(MdTextButton);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_BUTTON_MD_TEXT_BUTTON_H_