Revert of Move DefaultActivationClient to wm/core

ui/aura/client/default_activation_client.cc

Index: ui/aura/client/default_activation_client.cc
diff --git a/ui/aura/client/default_activation_client.cc b/ui/aura/client/default_activation_client.cc
new file mode 100644
index 0000000000000000000000000000000000000000..b11d7bfa3f96decb24465d6bc4fa178c72dc6c08
--- /dev/null
+++ b/ui/aura/client/default_activation_client.cc
@@ -0,0 +1,128 @@
+// 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/aura/client/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 aura {
+namespace client {
+
+////////////////////////////////////////////////////////////////////////////////
+// DefaultActivationClient, public:
+
+DefaultActivationClient::DefaultActivationClient(Window* root_window)
+    : last_active_(NULL) {
+  client::SetActivationClient(root_window, this);
+}
+
+DefaultActivationClient::~DefaultActivationClient() {
+  for (unsigned int i = 0; i < active_windows_.size(); ++i) {
+    active_windows_[i]->RemoveObserver(this);
+  }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// DefaultActivationClient, client::ActivationClient implementation:
+
+void DefaultActivationClient::AddObserver(
+    client::ActivationChangeObserver* observer) {
+  observers_.AddObserver(observer);
+}
+
+void DefaultActivationClient::RemoveObserver(
+    client::ActivationChangeObserver* observer) {
+  observers_.RemoveObserver(observer);
+}
+
+void DefaultActivationClient::ActivateWindow(Window* window) {
+  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(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(Window* window) {
+  aura::client::ActivationChangeObserver* observer =
+      aura::client::GetActivationChangeObserver(window);
+  if (observer)
+    observer->OnWindowActivated(NULL, window);
+  if (last_active_)
+    ActivateWindow(last_active_);
+}
+
+Window* DefaultActivationClient::GetActiveWindow() {
+  if (active_windows_.empty())
+    return NULL;
+  return active_windows_.back();
+}
+
+Window* DefaultActivationClient::GetActivatableWindow(Window* window) {
+  return NULL;
+}
+
+Window* DefaultActivationClient::GetToplevelWindow(Window* window) {
+  return NULL;
+}
+
+bool DefaultActivationClient::OnWillFocusWindow(Window* window,
+                                                const ui::Event* event) {
+  return true;
+}
+
+bool DefaultActivationClient::CanActivateWindow(Window* window) const {
+  return true;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// DefaultActivationClient, WindowObserver implementation:
+
+void DefaultActivationClient::OnWindowDestroyed(Window* window) {
+  if (window == last_active_)
+    last_active_ = NULL;
+
+  if (window == GetActiveWindow()) {
+    active_windows_.pop_back();
+    Window* next_active = GetActiveWindow();
+    if (next_active && aura::client::GetActivationChangeObserver(next_active)) {
+      aura::client::GetActivationChangeObserver(next_active)->OnWindowActivated(
+          next_active, NULL);
+    }
+    return;
+  }
+
+  RemoveActiveWindow(window);
+}
+
+void DefaultActivationClient::RemoveActiveWindow(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 client
+}  // namespace aura