wip: Second crack at implementing the touch exploration mode.

ui/aura/window_tree_host.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 UI_AURA_WINDOW_TREE_HOST_H_
 #define UI_AURA_WINDOW_TREE_HOST_H_
 
 #include <vector>
 
 #include "base/event_types.h"
 #include "base/message_loop/message_loop.h"
 #include "ui/aura/aura_export.h"
 #include "ui/base/cursor/cursor.h"
+#include "ui/events/event_source.h"
 #include "ui/gfx/native_widget_types.h"
 
 namespace gfx {
 class Insets;
 class Point;
 class Rect;
 class Size;
 class Transform;
 }
 
@@ skipping 34 matching lines @@
   ui::EventProcessor* event_processor();
 
   WindowEventDispatcher* dispatcher() {
     return const_cast<WindowEventDispatcher*>(
         const_cast<const WindowTreeHost*>(this)->dispatcher());
   }
   const WindowEventDispatcher* dispatcher() const { return dispatcher_.get(); }
 
   ui::Compositor* compositor() { return compositor_.get(); }
 
+  virtual ui::EventSource* GetEventSource() = 0;

[Daniel Erat, 2014/04/18 00:44:08]

move this down to where all of the other abstract methods are and add a comment

+
   // Gets/Sets the root window's transform.
   virtual gfx::Transform GetRootTransform() const;
   virtual void SetRootTransform(const gfx::Transform& transform);
   virtual gfx::Transform GetInverseRootTransform() const;
 
   // Updates the root window's size using |host_size|, current
   // transform and insets.
   virtual void UpdateRootWindowSize(const gfx::Size& host_size);
 
   // Returns the actual size of the screen.
@@ skipping 115 matching lines @@
   gfx::NativeCursor last_cursor_;
 
   scoped_ptr<ui::ViewProp> prop_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowTreeHost);
 };
 
 }  // namespace aura
 
 #endif  // UI_AURA_WINDOW_TREE_HOST_H_