Mac: Fix for janky tab dragging/reordering.

chrome/browser/ui/cocoa/tabs/tab_strip_drag_controller.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.
 
 #import "chrome/browser/ui/cocoa/tabs/tab_strip_drag_controller.h"
 
 #include <Carbon/Carbon.h>
 
 #include "base/mac/scoped_cftyperef.h"
 #import "base/mac/sdk_forward_declarations.h"
@@ skipping 22 matching lines @@
 - (NSArray*)dropTargetsForController:(TabWindowController*)dragController;
 - (void)setWindowBackgroundVisibility:(BOOL)shouldBeVisible;
 - (void)endDrag:(NSEvent*)event;
 - (void)continueDrag:(NSEvent*)event;
 @end
 
 ////////////////////////////////////////////////////////////////////////////////
 
 @implementation TabStripDragController
 
+@synthesize draggedTab = draggedTab_;
+
 - (id)initWithTabStripController:(TabStripController*)controller {
   if ((self = [super init])) {
     tabStrip_ = controller;
   }
   return self;
 }
 
 - (void)dealloc {
   [NSObject cancelPreviousPerformRequestsWithTarget:self];
   [super dealloc];
@@ skipping 445 matching lines @@
     [[targetController_ window] makeMainWindow];
   } else {
     [dragWindow_ setAlphaValue:0.5];
     [[draggedController_ overlayWindow] setHasShadow:NO];
     [[draggedController_ window] makeMainWindow];
   }
   chromeIsVisible_ = shouldBeVisible;
 }
 
 @end