Add window states docked; and docked minimized. Add wm window event to set docked and undocked.

ash/wm/workspace/workspace_window_resizer.cc

 // 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 "ash/wm/workspace/workspace_window_resizer.h"
 
 #include <algorithm>
 #include <cmath>
 #include <utility>
 #include <vector>
@@ skipping 54 matching lines @@
   // implement proper transition from one resizer to another during or at the
   // end of the drag. This also causes http://crbug.com/247085.
   // It seems the only thing the panel or dock resizer needs to do is notify the
   // layout manager when a docked window is being dragged. We should have a
   // better way of doing this, perhaps by having a way of observing drags or
   // having a generic drag window wrapper which informs a layout manager that a
   // drag has started or stopped.
   // It may be possible to refactor and eliminate chaining.
   WindowResizer* window_resizer = NULL;
 
-  if (!window_state->IsNormalOrSnapped())
+  if (!window_state->IsNormalOrSnapped() && !window_state->IsDocked())
     return scoped_ptr<WindowResizer>();
 
   int bounds_change = WindowResizer::GetBoundsChangeForWindowComponent(
       window_component);
   if (bounds_change == WindowResizer::kBoundsChangeDirection_None)
     return scoped_ptr<WindowResizer>();
 
   window_state->CreateDragDetails(window, point_in_parent, window_component,
       source);
   if (window->parent() &&
@@ skipping 964 matching lines @@
          snapped_type == wm::WINDOW_STATE_TYPE_RIGHT_SNAPPED);
   gfx::Rect snapped_bounds = ScreenUtil::GetDisplayWorkAreaBoundsInParent(
       GetTarget());
   if (snapped_type == wm::WINDOW_STATE_TYPE_RIGHT_SNAPPED)
     snapped_bounds.set_x(snapped_bounds.right() - bounds_in_parent.width());
   snapped_bounds.set_width(bounds_in_parent.width());
   return bounds_in_parent == snapped_bounds;
 }
 
 }  // namespace ash