(fix landed) Reland of name MaximizeMode to TabletMode

ash/wm/tablet_mode/tablet_mode_event_handler.cc

Index: ash/wm/tablet_mode/tablet_mode_event_handler.cc
diff --git a/ash/wm/tablet_mode/tablet_mode_event_handler.cc b/ash/wm/tablet_mode/tablet_mode_event_handler.cc
new file mode 100644
index 0000000000000000000000000000000000000000..9267e15fd9df77ca08d5e224450a8240f6874bba
--- /dev/null
+++ b/ash/wm/tablet_mode/tablet_mode_event_handler.cc
@@ -0,0 +1,66 @@
+// Copyright 2016 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/tablet_mode/tablet_mode_event_handler.h"
+
+#include "ash/session/session_controller.h"
+#include "ash/shell.h"
+#include "ash/wm/window_state.h"
+#include "ash/wm/window_util.h"
+#include "ash/wm/wm_event.h"
+#include "ash/wm_window.h"
+#include "ui/events/event.h"
+
+namespace ash {
+namespace wm {
+namespace {
+
+// The height of the area in which a touch operation leads to exiting the
+// full screen mode.
+const int kLeaveFullScreenAreaHeightInPixel = 2;
+
+}  // namespace
+
+TabletModeEventHandler::TabletModeEventHandler() {}
+
+TabletModeEventHandler::~TabletModeEventHandler() {}
+
+bool TabletModeEventHandler::ToggleFullscreen(const ui::TouchEvent& event) {
+  if (event.type() != ui::ET_TOUCH_PRESSED)
+    return false;
+
+  const SessionController* controller = Shell::Get()->session_controller();
+
+  if (controller->IsScreenLocked() ||
+      controller->GetSessionState() != session_manager::SessionState::ACTIVE) {
+    return false;
+  }
+
+  // Find the active window (from the primary screen) to un-fullscreen.
+  WmWindow* window = WmWindow::Get(GetActiveWindow());
+  if (!window)
+    return false;
+
+  WindowState* window_state = window->GetWindowState();
+  if (!window_state->IsFullscreen() || window_state->in_immersive_fullscreen())
+    return false;
+
+  // Test that the touch happened in the top or bottom lines.
+  int y = event.y();
+  if (y >= kLeaveFullScreenAreaHeightInPixel &&
+      y < (window->GetBounds().height() - kLeaveFullScreenAreaHeightInPixel)) {
+    return false;
+  }
+
+  // Do not exit fullscreen in kiosk mode.
+  if (Shell::Get()->session_controller()->IsKioskSession())
+    return false;
+
+  WMEvent toggle_fullscreen(WM_EVENT_TOGGLE_FULLSCREEN);
+  window->GetWindowState()->OnWMEvent(&toggle_fullscreen);
+  return true;
+}
+
+}  // namespace wm
+}  // namespace ash