Add ctrl+drag feature for allowing resizing window with exact positioning.

ash/wm/workspace/multi_window_resize_controller.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/multi_window_resize_controller.h"
 
 #include "ash/shell.h"
 #include "ash/shell_window_ids.h"
 #include "ash/wm/root_window_event_filter.h"
 #include "ash/wm/window_animations.h"
@@ skipping 390 matching lines @@
   int component = windows_.direction == LEFT_RIGHT ? HTRIGHT : HTBOTTOM;
   window_resizer_.reset(WorkspaceWindowResizer::Create(
       windows_.window1, parent_location, component, grid_size_, windows));
 }
 
 void MultiWindowResizeController::Resize(const gfx::Point& screen_location) {
   gfx::Point parent_location(screen_location);
   aura::Window::ConvertPointToWindow(windows_.window1->GetRootWindow(),
                                      windows_.window1->parent(),
                                      &parent_location);
-  window_resizer_->Drag(parent_location);
+  window_resizer_->Drag(parent_location, 0);
   gfx::Rect bounds = CalculateResizeWidgetBounds(parent_location);
   if (windows_.direction == LEFT_RIGHT)
     bounds.set_y(show_bounds_.y());
   else
     bounds.set_x(show_bounds_.x());
   resize_widget_->SetBounds(bounds);
 }
 
 void MultiWindowResizeController::CompleteResize() {
   window_resizer_->CompleteDrag();
@@ skipping 65 matching lines @@
 
   gfx::Point window_loc(screen_location);
   aura::Window::ConvertPointToWindow(
       window->GetRootWindow(), window, &window_loc);
   return window->HitTest(window_loc) &&
       window->delegate()->GetNonClientComponent(window_loc) == component;
 }
 
 }  // namespace internal
 }  // namespace ash