Refactors DimWindow and moves to ash/common

ash/wm/dim_window.cc

Index: ash/wm/dim_window.cc
diff --git a/ash/wm/dim_window.cc b/ash/wm/dim_window.cc
deleted file mode 100644
index 552789f54321b4322931d7db6c4700dd027c457d..0000000000000000000000000000000000000000
--- a/ash/wm/dim_window.cc
+++ /dev/null
@@ -1,79 +0,0 @@
-// Copyright 2015 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/dim_window.h"
-#include "base/time/time.h"
-#include "ui/aura/client/aura_constants.h"
-#include "ui/aura/window_property.h"
-#include "ui/compositor/layer.h"
-#include "ui/compositor/scoped_layer_animation_settings.h"
-#include "ui/wm/core/visibility_controller.h"
-#include "ui/wm/core/window_animations.h"
-
-DECLARE_WINDOW_PROPERTY_TYPE(ash::DimWindow*);
-
-namespace ash {
-namespace {
-
-DEFINE_LOCAL_WINDOW_PROPERTY_KEY(DimWindow*, kDimWindowKey, nullptr);
-
-const int kDefaultDimAnimationDurationMs = 200;
-
-const float kDefaultDimOpacity = 0.5f;
-
-}  // namespace
-
-// static
-DimWindow* DimWindow::Get(aura::Window* container) {
-  return container->GetProperty(kDimWindowKey);
-}
-
-DimWindow::DimWindow(aura::Window* parent)
-    : aura::Window(nullptr), parent_(parent) {
-  SetType(ui::wm::WINDOW_TYPE_NORMAL);
-  Init(ui::LAYER_SOLID_COLOR);
-  wm::SetWindowVisibilityChangesAnimated(this);
-  wm::SetWindowVisibilityAnimationType(
-      this, wm::WINDOW_VISIBILITY_ANIMATION_TYPE_FADE);
-  wm::SetWindowVisibilityAnimationDuration(
-      this, base::TimeDelta::FromMilliseconds(kDefaultDimAnimationDurationMs));
-
-  SetDimOpacity(kDefaultDimOpacity);
-
-  parent->AddChild(this);
-  parent->AddObserver(this);
-  parent->SetProperty(kDimWindowKey, this);
-  parent->StackChildAtTop(this);
-
-  SetBounds(parent->bounds());
-}
-
-DimWindow::~DimWindow() {
-  if (parent_) {
-    parent_->ClearProperty(kDimWindowKey);
-    parent_->RemoveObserver(this);
-    parent_ = nullptr;
-  }
-}
-
-void DimWindow::SetDimOpacity(float target_opacity) {
-  layer()->SetColor(SkColorSetA(SK_ColorBLACK, 255 * target_opacity));
-}
-
-void DimWindow::OnWindowBoundsChanged(aura::Window* window,
-                                      const gfx::Rect& old_bounds,
-                                      const gfx::Rect& new_bounds) {
-  if (window == parent_)
-    SetBounds(new_bounds);
-}
-
-void DimWindow::OnWindowDestroying(Window* window) {
-  if (window == parent_) {
-    window->ClearProperty(kDimWindowKey);
-    window->RemoveObserver(this);
-    parent_ = nullptr;
-  }
-}
-
-}  // namespace ash