Revert of Move DefaultActivationClient to wm/core

ui/wm/core/default_activation_client.cc

Index: ui/wm/core/default_activation_client.cc
diff --git a/ui/wm/core/default_activation_client.cc b/ui/wm/core/default_activation_client.cc
deleted file mode 100644
index 222c9acb4cbb206b4712f40cf0f295aa69be538d..0000000000000000000000000000000000000000
--- a/ui/wm/core/default_activation_client.cc
+++ /dev/null
@@ -1,157 +0,0 @@
-// Copyright 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 "ui/wm/core/default_activation_client.h"
-
-#include "ui/aura/window.h"
-#include "ui/wm/public/activation_change_observer.h"
-#include "ui/wm/public/activation_delegate.h"
-
-namespace wm {
-
-// Takes care of observing root window destruction & destroying the client.
-class DefaultActivationClient::Deleter : public aura::WindowObserver {
- public:
-  Deleter(DefaultActivationClient* client, aura::Window* root_window)
-      : client_(client),
-        root_window_(root_window) {
-    root_window_->AddObserver(this);
-  }
-
- private:
-  virtual ~Deleter() {}
-
-  // Overridden from WindowObserver:
-  virtual void OnWindowDestroyed(aura::Window* window) OVERRIDE {
-    DCHECK_EQ(window, root_window_);
-    root_window_->RemoveObserver(this);
-    delete client_;
-    delete this;
-  }
-
-  DefaultActivationClient* client_;
-  aura::Window* root_window_;
-
-  DISALLOW_COPY_AND_ASSIGN(Deleter);
-};
-
-////////////////////////////////////////////////////////////////////////////////
-// DefaultActivationClient, public:
-
-DefaultActivationClient::DefaultActivationClient(aura::Window* root_window)
-    : last_active_(NULL) {
-  aura::client::SetActivationClient(root_window, this);
-  new Deleter(this, root_window);
-}
-
-////////////////////////////////////////////////////////////////////////////////
-// DefaultActivationClient, client::ActivationClient implementation:
-
-void DefaultActivationClient::AddObserver(
-    aura::client::ActivationChangeObserver* observer) {
-  observers_.AddObserver(observer);
-}
-
-void DefaultActivationClient::RemoveObserver(
-    aura::client::ActivationChangeObserver* observer) {
-  observers_.RemoveObserver(observer);
-}
-
-void DefaultActivationClient::ActivateWindow(aura::Window* window) {
-  aura::Window* last_active = GetActiveWindow();
-  if (last_active == window)
-    return;
-
-  last_active_ = last_active;
-  RemoveActiveWindow(window);
-  active_windows_.push_back(window);
-  window->parent()->StackChildAtTop(window);
-  window->AddObserver(this);
-
-  FOR_EACH_OBSERVER(aura::client::ActivationChangeObserver,
-                    observers_,
-                    OnWindowActivated(window, last_active));
-
-  aura::client::ActivationChangeObserver* observer =
-      aura::client::GetActivationChangeObserver(last_active);
-  if (observer)
-    observer->OnWindowActivated(window, last_active);
-  observer = aura::client::GetActivationChangeObserver(window);
-  if (observer)
-    observer->OnWindowActivated(window, last_active);
-}
-
-void DefaultActivationClient::DeactivateWindow(aura::Window* window) {
-  aura::client::ActivationChangeObserver* observer =
-      aura::client::GetActivationChangeObserver(window);
-  if (observer)
-    observer->OnWindowActivated(NULL, window);
-  if (last_active_)
-    ActivateWindow(last_active_);
-}
-
-aura::Window* DefaultActivationClient::GetActiveWindow() {
-  if (active_windows_.empty())
-    return NULL;
-  return active_windows_.back();
-}
-
-aura::Window* DefaultActivationClient::GetActivatableWindow(
-    aura::Window* window) {
-  return NULL;
-}
-
-aura::Window* DefaultActivationClient::GetToplevelWindow(aura::Window* window) {
-  return NULL;
-}
-
-bool DefaultActivationClient::OnWillFocusWindow(aura::Window* window,
-                                                const ui::Event* event) {
-  return true;
-}
-
-bool DefaultActivationClient::CanActivateWindow(aura::Window* window) const {
-  return true;
-}
-
-////////////////////////////////////////////////////////////////////////////////
-// DefaultActivationClient, aura::WindowObserver implementation:
-
-void DefaultActivationClient::OnWindowDestroyed(aura::Window* window) {
-  if (window == last_active_)
-    last_active_ = NULL;
-
-  if (window == GetActiveWindow()) {
-    active_windows_.pop_back();
-    aura::Window* next_active = GetActiveWindow();
-    if (next_active && aura::client::GetActivationChangeObserver(next_active)) {
-      aura::client::GetActivationChangeObserver(next_active)->OnWindowActivated(
-          next_active, NULL);
-    }
-    return;
-  }
-
-  RemoveActiveWindow(window);
-}
-
-////////////////////////////////////////////////////////////////////////////////
-// DefaultActivationClient, private:
-
-DefaultActivationClient::~DefaultActivationClient() {
-  for (unsigned int i = 0; i < active_windows_.size(); ++i) {
-    active_windows_[i]->RemoveObserver(this);
-  }
-}
-
-void DefaultActivationClient::RemoveActiveWindow(aura::Window* window) {
-  for (unsigned int i = 0; i < active_windows_.size(); ++i) {
-    if (active_windows_[i] == window) {
-      active_windows_.erase(active_windows_.begin() + i);
-      window->RemoveObserver(this);
-      return;
-    }
-  }
-}
-
-}  // namespace wm