(fix landed) Reland of name MaximizeMode to TabletMode

ash/wm/tablet_mode/tablet_mode_window_manager.h

Index: ash/wm/tablet_mode/tablet_mode_window_manager.h
diff --git a/ash/wm/tablet_mode/tablet_mode_window_manager.h b/ash/wm/tablet_mode/tablet_mode_window_manager.h
new file mode 100644
index 0000000000000000000000000000000000000000..bdf552173750bf8fd71925ec8309bcdf6c81d9cb
--- /dev/null
+++ b/ash/wm/tablet_mode/tablet_mode_window_manager.h
@@ -0,0 +1,145 @@
+// Copyright 2014 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.
+
+#ifndef ASH_WM_TABLET_MODE_TABLET_MODE_WINDOW_MANAGER_H_
+#define ASH_WM_TABLET_MODE_TABLET_MODE_WINDOW_MANAGER_H_
+
+#include <stdint.h>
+
+#include <map>
+#include <unordered_set>
+
+#include "ash/ash_export.h"
+#include "ash/shell_observer.h"
+#include "ash/wm/window_state.h"
+#include "base/macros.h"
+#include "ui/aura/window_observer.h"
+#include "ui/display/display_observer.h"
+
+namespace aura {
+class Window;
+}
+
+namespace ash {
+class TabletModeController;
+class TabletModeWindowState;
+
+namespace wm {
+class TabletModeEventHandler;
+}
+
+// A window manager which - when created - will force all windows into tablet
+// mode. Exception are panels and windows which cannot be maximized.
+// Windows which cannot be maximized / resized are centered with a layer placed
+// behind the window so that no other windows are visible and/or obscured.
+// With the destruction of the manager all windows will be restored to their
+// original state.
+class ASH_EXPORT TabletModeWindowManager : public aura::WindowObserver,
+                                           public display::DisplayObserver,
+                                           public ShellObserver {
+ public:
+  // This should only be deleted by the creator (ash::Shell).
+  ~TabletModeWindowManager() override;
+
+  // Returns the number of maximized & tracked windows by this manager.
+  int GetNumberOfManagedWindows();
+
+  // Adds a window which needs to be maximized. This is used by other window
+  // managers for windows which needs to get tracked due to (upcoming) state
+  // changes.
+  // The call gets ignored if the window was already or should not be handled.
+  void AddWindow(aura::Window* window);
+
+  // Called from a window state object when it gets destroyed.
+  void WindowStateDestroyed(aura::Window* window);
+
+  // ShellObserver overrides:
+  void OnOverviewModeStarting() override;
+  void OnOverviewModeEnded() override;
+
+  // Overridden from WindowObserver:
+  void OnWindowDestroying(aura::Window* window) override;
+  void OnWindowHierarchyChanged(const HierarchyChangeParams& params) override;
+  void OnWindowPropertyChanged(aura::Window* window,
+                               const void* key,
+                               intptr_t old) override;
+  void OnWindowBoundsChanged(aura::Window* window,
+                             const gfx::Rect& old_bounds,
+                             const gfx::Rect& new_bounds) override;
+  void OnWindowVisibilityChanged(aura::Window* window, bool visible) override;
+
+  // display::DisplayObserver overrides:
+  void OnDisplayAdded(const display::Display& display) override;
+  void OnDisplayRemoved(const display::Display& display) override;
+  void OnDisplayMetricsChanged(const display::Display& display,
+                               uint32_t metrics) override;
+
+  // Tell all managing windows not to handle WM events.
+  void SetIgnoreWmEventsForExit();
+
+ protected:
+  friend class TabletModeController;
+
+  // The object should only be created by the ash::Shell.
+  TabletModeWindowManager();
+
+ private:
+  using WindowToState = std::map<aura::Window*, TabletModeWindowState*>;
+
+  // Maximize all windows and restore their current state.
+  void MaximizeAllWindows();
+
+  // Restore all windows to their previous state.
+  void RestoreAllWindows();
+
+  // Set whether to defer bounds updates on all tracked windows. When set to
+  // false bounds will be updated as they may be stale.
+  void SetDeferBoundsUpdates(bool defer_bounds_updates);
+
+  // If the given window should be handled by us, this function will maximize it
+  // and add it to the list of known windows (remembering the initial show
+  // state).
+  // Note: If the given window cannot be handled by us the function will return
+  // immediately.
+  void MaximizeAndTrackWindow(aura::Window* window);
+
+  // Remove a window from our tracking list.
+  void ForgetWindow(aura::Window* window);
+
+  // Returns true when the given window should be modified in any way by us.
+  bool ShouldHandleWindow(aura::Window* window);
+
+  // Add window creation observers to track creation of new windows.
+  void AddWindowCreationObservers();
+
+  // Remove Window creation observers.
+  void RemoveWindowCreationObservers();
+
+  // Change the internal state (e.g. observers) when the display configuration
+  // changes.
+  void DisplayConfigurationChanged();
+
+  // Returns true when the |window| is a container window.
+  bool IsContainerWindow(aura::Window* window);
+
+  // Add a backdrop behind the currently active window on each desktop.
+  void EnableBackdropBehindTopWindowOnEachDisplay(bool enable);
+
+  // Every window which got touched by our window manager gets added here.
+  WindowToState window_state_map_;
+
+  // All container windows which have to be tracked.
+  std::unordered_set<aura::Window*> observed_container_windows_;
+
+  // Windows added to the container, but not yet shown.
+  std::unordered_set<aura::Window*> added_windows_;
+
+  std::unique_ptr<wm::TabletModeEventHandler> event_handler_;
+
+  DISALLOW_COPY_AND_ASSIGN(TabletModeWindowManager);
+};
+
+}  // namespace ash
+
+#endif  // ASH_WM_TABLET_MODE_TABLET_MODE_WINDOW_MANAGER_H_