Refactor intra-strip panel drags by introducing PanelDragController.

chrome/browser/ui/panels/panel_window_controller_cocoa.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_PANELS_PANEL_WINDOW_CONTROLLER_COCOA_H_
 #define CHROME_BROWSER_UI_PANELS_PANEL_WINDOW_CONTROLLER_COCOA_H_
 
 // A class acting as the Objective-C controller for the Panel window
 // object. Handles interactions between Cocoa and the cross-platform
 // code. Each window has a single titlebar and is managed/owned by Panel.
@@ skipping 83 matching lines @@
 // indicating the potential drop slot.
 // |frame| is in screen coordinates, same as [window frame].
 // |animate| controls if the bounds animation is needed or not.
 - (void)setPanelFrame:(NSRect)frame
               animate:(BOOL)animate;
 
 // Used by PanelTitlebarViewCocoa when user rearranges the Panels by dragging.
 - (BOOL)isDraggable;
 - (void)startDrag;
 - (void)endDrag:(BOOL)cancelled;
-- (void)dragWithDeltaX:(int)deltaX;
+- (void)dragWithDeltaX:(int)deltaX
+                deltaY:(int)deltaY;
 
 // Accessor for titlebar view.
 - (PanelTitlebarViewCocoa*)titlebarView;
 // Returns the height of titlebar, used to show the titlebar in
 // "Draw Attention" state.
 - (int)titlebarHeightInScreenCoordinates;
 
 // Invoked when user clicks on the titlebar. Attempts to flip the
 // Minimized/Restored states.
 - (void)onTitlebarMouseClicked;
@@ skipping 24 matching lines @@
 - (BOOL)canBecomeKeyWindow;
 
 // Returns width of titlebar when shown in "icon only" mode.
 - (int)titlebarIconOnlyWidthInScreenCoordinates;
 
 - (void)applyVisualStyleForStrip;
 
 @end  // @interface PanelWindowController
 
 #endif  // CHROME_BROWSER_UI_PANELS_PANEL_WINDOW_CONTROLLER_COCOA_H_