Refactors DimWindow and moves to ash/common

ash/aura/wm_window_aura.cc

Index: ash/aura/wm_window_aura.cc
diff --git a/ash/aura/wm_window_aura.cc b/ash/aura/wm_window_aura.cc
index f923414d7fe790cb5b17b0c18d99b55e00e06b5e..30b185654345275c742182bcfe30088c357da767 100644
--- a/ash/aura/wm_window_aura.cc
+++ b/ash/aura/wm_window_aura.cc
@@ -135,6 +135,10 @@ const aura::Window* WmWindowAura::GetAuraWindow(const WmWindow* wm_window) {
                    : nullptr;
 }
 
+void WmWindowAura::Destroy() {
+  delete window_;
+}

[James Cook, 2016/09/09 21:33:36]

set window_ = nullptr here?

[sky, 2016/09/09 21:50:45]

'this' should be deleted as a result of delete window_. I'll add a comment.

+
 const WmWindow* WmWindowAura::GetRootWindow() const {
   return Get(window_->GetRootWindow());
 }
@@ -365,6 +369,10 @@ WmLayoutManager* WmWindowAura::GetLayoutManager() {
   return adapter ? adapter->wm_layout_manager() : nullptr;
 }
 
+void WmWindowAura::SetVisibilityChangesAnimated() {
+  ::wm::SetWindowVisibilityChangesAnimated(window_);
+}
+
 void WmWindowAura::SetVisibilityAnimationType(int type) {
   ::wm::SetWindowVisibilityAnimationType(window_, type);
 }