Attempt 2: Allows tab dragging when maximized on aura. To fix it I made it so

chrome/browser/ui/views/tabs/tab_drag_controller2.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_VIEWS_TABS_TAB_DRAG_CONTROLLER2_H_
 #define CHROME_BROWSER_UI_VIEWS_TABS_TAB_DRAG_CONTROLLER2_H_
 #pragma once
 
 #include <vector>
 
@@ skipping 261 matching lines @@
   static TabStripModel* GetModel(TabStrip* tabstrip);
 
   // Returns the BrowserView of the currently attached TabStrip.
   BrowserView* GetAttachedBrowserView();
 
   // Creates and returns a new Browser to handle the drag.
   Browser* CreateBrowserForDrag(TabStrip* source,
                                 const gfx::Point& screen_point,
                                 std::vector<gfx::Rect>* drag_bounds);
 
+  // Marks whether |window| is constrained. While dragging we set this to false
+  // to allow maximized windows to move any where.
+  void SetTrackedByWorkspace(gfx::NativeWindow window, bool value);
+
   // Handles registering for notifications.
   content::NotificationRegistrar registrar_;
 
   // The TabStrip the drag originated from. This is set to NULL if the source
   // tabstrip is deleted while we're detached.
   TabStrip* source_tabstrip_;
 
   // The TabStrip the dragged Tab is currently attached to, or NULL if the
   // dragged Tab is detached.
   TabStrip* attached_tabstrip_;
@@ skipping 90 matching lines @@
   // Non-null for the duration of RunMoveLoop.
   BrowserView* move_loop_browser_view_;
 
   // If non-null set to true from destructor.
   bool* destroyed_;
 
   DISALLOW_COPY_AND_ASSIGN(TabDragController2);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_TABS_TAB_DRAG_CONTROLLER2_H_