[Aura] Fix HtmlDialogBrowserTest.SizeWindow.

ui/aura/window.cc

 // Copyright (c) 2011 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 "ui/aura/window.h"
 
 #include <algorithm>
 
 #include "base/logging.h"
 #include "base/stl_util.h"
@@ skipping 411 matching lines @@
 }
 
 Desktop* Window::GetDesktop() {
   return parent_ ? parent_->GetDesktop() : NULL;
 }
 
 void Window::WindowDetachedFromDesktop(aura::Window* window) {
 }
 
 void Window::SetBoundsInternal(const gfx::Rect& new_bounds) {
+  gfx::Rect actual_new_bounds(new_bounds);
+
+  // Gives delegate a change to examine and change the new bounds.
+  if (delegate_)
+    delegate_->OnBoundsChanging(&actual_new_bounds);
+
   const gfx::Rect old_bounds = layer_->GetTargetBounds();
 
   // Always need to set the layer's bounds -- even if it is to the same thing.
   // This may cause important side effects such as stopping animation.
-  layer_->SetBounds(new_bounds);
+  layer_->SetBounds(actual_new_bounds);
 
   // If we're not changing the effective bounds, then we can bail early and skip
   // notifying our listeners.
-  if (old_bounds == new_bounds)
+  if (old_bounds == actual_new_bounds)
     return;
 
   if (layout_manager_.get())
     layout_manager_->OnWindowResized();
   if (delegate_)
-    delegate_->OnBoundsChanged(old_bounds, new_bounds);
+    delegate_->OnBoundsChanged(old_bounds, actual_new_bounds);
 }
 
 void Window::SetVisible(bool visible) {
   if (visible == layer_->visible())
     return;  // No change.
 
   bool was_visible = IsVisible();
   layer_->SetVisible(visible);
   bool is_visible = IsVisible();
   if (was_visible != is_visible) {
@@ skipping 48 matching lines @@
 
   return delegate_ ? this : NULL;
 }
 
 void Window::OnPaintLayer(gfx::Canvas* canvas) {
   if (delegate_)
     delegate_->OnPaint(canvas);
 }
 
 }  // namespace aura