Moves WorkspaceEventHandler to ash/common

ash/common/wm/workspace/workspace_event_handler.h

 // Copyright (c) 2012 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_WORKSPACE_WORKSPACE_EVENT_HANDLER_H_
-#define ASH_WM_WORKSPACE_WORKSPACE_EVENT_HANDLER_H_
+#ifndef ASH_COMMON_WM_WORKSPACE_WORKSPACE_EVENT_HANDLER_H_
+#define ASH_COMMON_WM_WORKSPACE_WORKSPACE_EVENT_HANDLER_H_
 
+#include "ash/ash_export.h"
 #include "ash/common/wm/workspace/multi_window_resize_controller.h"
 #include "base/macros.h"
-#include "ui/events/event_handler.h"
+
+namespace ui {
+class GestureEvent;
+class MouseEvent;
+}
 
 namespace ash {
+class WmWindow;
 class WorkspaceEventHandlerTestHelper;
 
 namespace wm {
 class WindowState;
 }
 
-class WorkspaceEventHandler : public ui::EventHandler {
+// ui::EventHandler like class installed on the window associated with
+// WorkspaceLayoutManager. This handles various events happening on child
+// windows and takes appropriate action. It is expected the environment specific
+// file calls OnMouseEvent()/OnGestureEvent() as appropriate.
+class ASH_EXPORT WorkspaceEventHandler {
  public:
   WorkspaceEventHandler();
-  ~WorkspaceEventHandler() override;
+  virtual ~WorkspaceEventHandler();
 
-  // ui::EventHandler:
-  void OnMouseEvent(ui::MouseEvent* event) override;
-  void OnGestureEvent(ui::GestureEvent* event) override;
+  void OnMouseEvent(ui::MouseEvent* event, WmWindow* target);
+  void OnGestureEvent(ui::GestureEvent* event, WmWindow* target);
 
  private:
   friend class WorkspaceEventHandlerTestHelper;
 
   // Determines if |event| corresponds to a double click on either the top or
   // bottom vertical resize edge, and if so toggles the vertical height of the
   // window between its restored state and the full available height of the
   // workspace.
   void HandleVerticalResizeDoubleClick(wm::WindowState* window_state,
                                        ui::MouseEvent* event);
 
   MultiWindowResizeController multi_window_resize_controller_;
 
   // The non-client component for the target of a MouseEvent or GestureEvent.
   // Events can be destructive to the window tree, which can cause the
   // component of a ui::EF_IS_DOUBLE_CLICK event to no longer be the same as
   // that of the initial click. Acting on a double click should only occur for
   // matching components. This will be set for left clicks, and tap events.
   int click_component_;
 
   DISALLOW_COPY_AND_ASSIGN(WorkspaceEventHandler);
 };
 
 }  // namespace ash
 
-#endif  // ASH_WM_WORKSPACE_WORKSPACE_EVENT_HANDLER_H_
+#endif  // ASH_COMMON_WM_WORKSPACE_WORKSPACE_EVENT_HANDLER_H_