Keep the size button pressed when the user hovers the snap left or snap right button

ash/wm/caption_buttons/alternate_frame_size_button_delegate.h

 // Copyright 2013 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 ASH_WM_CAPTION_BUTTONS_ALTERNATE_FRAME_SIZE_BUTTON_DELEGATE_H_
 #define ASH_WM_CAPTION_BUTTONS_ALTERNATE_FRAME_SIZE_BUTTON_DELEGATE_H_
 
 #include "ash/ash_export.h"
 #include "ash/wm/caption_buttons/caption_button_types.h"
 
 namespace gfx {
 class Insets;
 class Point;
+class Vector2d;
 }
 
 namespace ash {
 class FrameCaptionButton;
 
 // Delegate interface for AlternateFrameSizeButton.
 class ASH_EXPORT AlternateFrameSizeButtonDelegate {
  public:
   enum Animate {
     ANIMATE_YES,
     ANIMATE_NO
   };
 
   // Returns whether the minimize button is visible.
   virtual bool IsMinimizeButtonVisible() const = 0;
 
   // Reset the caption button views::Button::ButtonState back to normal. If
   // |animate| is ANIMATE_YES, the buttons will crossfade back to their
   // original icons.
   virtual void SetButtonsToNormal(Animate animate) = 0;
 
   // Sets the minimize and close button icons. The buttons will crossfade to
   // their new icons if |animate| is ANIMATE_YES.
   virtual void SetButtonIcons(CaptionButtonIcon left_button_action,
                               CaptionButtonIcon right_button_action,
                               Animate animate) = 0;
 
-  // Presses the button at |position_in_screen| and unpresses any other pressed
-  // caption buttons.
-  // |pressed_button_hittest_insets| indicates how much the hittest insets for
-  // the currently pressed button should be expanded if no button was found at
-  // |position_in_screen| using the normal button hittest insets.
-  // Returns the button which was pressed.
-  virtual const FrameCaptionButton* PressButtonAt(
-      const gfx::Point& position_in_screen,
-      const gfx::Insets& pressed_button_hittest_insets) const = 0;
+  // Returns the button closest to |position_in_screen|.
+  virtual const FrameCaptionButton* GetButtonClosestTo(
+      const gfx::Point& position_in_screen) const = 0;
+
+  // Sets |to_hover| and |to_pressed| to STATE_HOVERED and STATE_PRESSED
+  // respectively. All other buttons are to set to STATE_NORMAL.
+  virtual void SetHoveredAndPressedButtons(
+      const FrameCaptionButton* to_hover,
+      const FrameCaptionButton* to_press) = 0;
 
  protected:
   virtual ~AlternateFrameSizeButtonDelegate() {}
 };
 
 }  // namespace ash
 
 #endif  // ASH_WM_CAPTION_BUTTONS_ALTERNATE_FRAME_SIZE_BUTTON_DELEGATE_H_