Refactor intra-strip panel drags by introducing PanelDragController.

chrome/browser/ui/panels/panel_window_controller_cocoa.mm

 // 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.
 
 #include "chrome/browser/ui/panels/panel_window_controller_cocoa.h"
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/logging.h"
 #include "base/mac/bundle_locations.h"
@@ skipping 394 matching lines @@
 - (void)startDrag {
   animateOnBoundsChange_ = NO;
   windowShim_->panel()->manager()->StartDragging(windowShim_->panel());
 }
 
 - (void)endDrag:(BOOL)cancelled {
   animateOnBoundsChange_ = YES;
   windowShim_->panel()->manager()->EndDragging(cancelled);
 }
 
-- (void)dragWithDeltaX:(int)deltaX {
-  windowShim_->panel()->manager()->Drag(deltaX);
+- (void)dragWithDeltaX:(int)deltaX
+                deltaY:(int)deltaY {
+  windowShim_->panel()->manager()->Drag(deltaX, deltaY);
 }
 
 - (void)setPanelFrame:(NSRect)frame
               animate:(BOOL)animate {
   // Setup the whole window as the tracking area so that we can get notified
   // when the mouse enters or leaves the window. This will make us be able to
   // show or hide settings button accordingly.
   NSRect localBounds = frame;
   localBounds.origin = NSZeroPoint;
   windowTrackingArea_.reset(
@@ skipping 191 matching lines @@
 
 - (BOOL)canBecomeKeyWindow {
   // Panel can only gain focus if it is expanded. Minimized panels do not
   // participate in Cmd-~ rotation.
   // TODO(dimich): If it will be ever desired to expand/focus the Panel on
   // keyboard navigation or via main menu, the care should be taken to avoid
   // cases when minimized Panel is getting keyboard input, invisibly.
   return windowShim_->panel()->expansion_state() == Panel::EXPANDED;
 }
 @end