Fix AdjustBoundsToEnsureWindowVisibility to work with non primary display bounds

ash/wm/dock/docked_window_layout_manager.cc

 // Copyright (c) 2013 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/dock/docked_window_layout_manager.h"
 
 #include "ash/ash_switches.h"
 #include "ash/screen_ash.h"
 #include "ash/shelf/shelf.h"
 #include "ash/shelf/shelf_constants.h"
@@ skipping 575 matching lines @@
 }
 
 void DockedWindowLayoutManager::OnWindowAddedToLayout(aura::Window* child) {
   if (IsPopupOrTransient(child))
     return;
   // Dragged windows are already observed by StartDragging and do not change
   // docked alignment during the drag.
   if (child == dragged_window_)
     return;
   // If this is the first window getting docked - update alignment.
+  // TODO(oshima|varkha): A window can be added without proper bounds when
+  // window is moved to another display via API or due to display configuration
+  // change, so the the alignment may not be valid.
   if (alignment_ == DOCKED_ALIGNMENT_NONE) {
     alignment_ = GetAlignmentOfWindow(child);
     DCHECK(alignment_ != DOCKED_ALIGNMENT_NONE);
   }
   MaybeMinimizeChildrenExcept(child);
   child->AddObserver(this);
   wm::GetWindowState(child)->AddObserver(this);
   Relayout();
   UpdateDockBounds(DockedWindowLayoutManagerObserver::CHILD_CHANGED);
 }
@@ skipping 637 matching lines @@
 void DockedWindowLayoutManager::OnKeyboardBoundsChanging(
     const gfx::Rect& keyboard_bounds) {
   // This bounds change will have caused a change to the Shelf which does not
   // propagate automatically to this class, so manually recalculate bounds.
   Relayout();
   UpdateDockBounds(DockedWindowLayoutManagerObserver::KEYBOARD_BOUNDS_CHANGING);
 }
 
 }  // namespace internal
 }  // namespace ash