Revert of Clean up WindowEventDispatcher some more.

ui/aura/window_tree_host_delegate.h

Index: ui/aura/window_tree_host_delegate.h
diff --git a/ui/aura/window_tree_host_delegate.h b/ui/aura/window_tree_host_delegate.h
new file mode 100644
index 0000000000000000000000000000000000000000..c5ba407e0b05ab47624e7936fe9cef06a0f02447
--- /dev/null
+++ b/ui/aura/window_tree_host_delegate.h
@@ -0,0 +1,60 @@
+// 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 UI_AURA_WINDOW_TREE_HOST_DELEGATE_H_
+#define UI_AURA_WINDOW_TREE_HOST_DELEGATE_H_
+
+#include "ui/aura/aura_export.h"
+
+namespace gfx {
+class Point;
+class Rect;
+class Size;
+}
+
+namespace ui {
+class Event;
+class EventProcessor;
+class KeyEvent;
+class MouseEvent;
+class ScrollEvent;
+class TouchEvent;
+}
+
+namespace aura {
+
+class RootWindow;
+
+// A private interface used by WindowTreeHost implementations to communicate
+// with their owning RootWindow.
+class AURA_EXPORT WindowTreeHostDelegate {
+ public:
+  virtual void OnHostCancelMode() = 0;
+
+  // Called when the windowing system activates the window.
+  virtual void OnHostActivated() = 0;
+
+  // Called when system focus is changed to another window.
+  virtual void OnHostLostWindowCapture() = 0;
+
+  // Called when the windowing system has mouse grab because it's performing a
+  // window move on our behalf, but we should still paint as if we're active.
+  virtual void OnHostLostMouseGrab() = 0;
+
+  virtual void OnHostResized(const gfx::Size& size) = 0;
+
+  virtual void OnCursorMovedToRootLocation(const gfx::Point& root_location) = 0;
+
+  virtual WindowEventDispatcher* AsDispatcher() = 0;
+  virtual const WindowEventDispatcher* AsDispatcher() const = 0;
+
+  virtual ui::EventProcessor* GetEventProcessor() = 0;
+
+ protected:
+  virtual ~WindowTreeHostDelegate() {}
+};
+
+}  // namespace aura
+
+#endif  // UI_AURA_WINDOW_TREE_HOST_DELEGATE_H_